Please assess the completion status of the following clinical trial:

Trial Title: Efficacy and Safety of Oral Sulfate Solution on Bowel Preparation for Colonoscopy

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: DIAGNOSTIC
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Voluntarily participate and sign informed consent;~* Scheduling screening, surveillance, and diagnostic colonoscopy;~* Necessary body fluid and blood electrolyte balance (the test values of potassium, sodium, chlorine, calcium and magnesium in blood biochemistry during screening period should not exceed 10% of the normal range).~Exclusion Criteria:~* Subjects who used drugs that affect gastrointestinal dynamics, affect kidney function, or increase the risk of fluid retention or electrolyte disorders within 7 days before the start of the trial;~* Subjects with serious cardiac and cerebrovascular diseases, bronchial and lung diseases, suffering from metabolic disease or endocrine disease, abnormal blood clotting mechanism, malignant tumor, electrolyte abnormalities, epilepsy, Renal or liver dysfunction;~* Subjects with confirmed or suspected gastrointestinal obstruction, gastric retention, gastroparesis, gastric emptying disorder or acute gastrointestinal bleeding;~* Subjects with acute severe colitis (such as active severe inflammatory bowel disease, acute bacterial dysentery, diverticulitis, etc.);~* Subjects with a history of major gastrointestinal surgery (e.g. gastric bypass, gastric septal surgery, colostomy, colectomy, etc.);~* Subjects with constipation or suspected severe gastric motility disorder;~* Women with positive pregnancy tests or pregnancy plans, and women in lactation;~* Subjects who have participated in any other clinical trials within the last 3 months;~* Subjects with any other conditions that the investigator considered inappropriate for inclusion.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 75 Years
- Healthy Volunteers: t

Study Arms:
- OSS group (Type: EXPERIMENTAL): Bowel preparation for colonoscopy was performed using oral sulfate solution as laxative
- Polyethylene glycol group (Type: ACTIVE_COMPARATOR): Bowel preparation for colonoscopy was performed using polyethylene glycol as laxative

Based on this trial design, predict the completion outcome and termination type (if applicable).