Question

【题目】It isn't easy for the students________ the river.

A. cross B. across

C. to cross D. to across

Answer 1

【答案】C

【解析】句意：对学生来说过河是不容易的。It is＋adj.＋for sb.＋to do sth.是固定句型，意为“对于某人来说做某事是……”，故可排除A、B两项；再由across是介词，其前不能与介词to连用，可知答案为C项。