Question

【题目】It's difficult for him ________ the river to school every day.

A.crossB.crossingC.to cross

Answer 1

【答案】C

【解析】

句意：对他来说每天跨过那条河到学校很难。

考查动词不定式。cross动词原形；crossing动名词；to cross动词不定式。it是形式主语，表示“做某事对某人来说很难”用it is difficult for sb.to do。句子的真正主语是动词不定式to cross。故选C。