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

A. cross B. across

C. to cross D. to across

【答案】C

【解析】句意：對(duì)學(xué)生來(lái)說(shuō)過(guò)河是不容易的。It is＋adj.＋for sb.＋to do sth.是固定句型，意為“對(duì)于某人來(lái)說(shuō)做某事是……”，故可排除A、B兩項(xiàng)；再由across是介詞，其前不能與介詞to連用，可知答案為C項(xiàng)。

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