托业考试

根据网考网考试中心的统计分析，以下试题在2018/1/15日托业考试习题练习中，答错率较高，为：89%
【单选题】West Passage Trains customers are ______ to check the schedule frequently because delays, cancellations and other changes can occur.

• (A) advise
• (B) advising
• (C) advised
• (D) to advise