Question

【题目】It's interesting ________ in the river in summer.

A. swim B. to swim

C. swims D. swimming

Answer 1

【答案】B

【解析】句意：夏天在河里游泳很有趣。本题是一个由“it”来做形式主语的简单句，It is+形容词+to do sth.意为：“做某事是…”，真正的主语是后面的动词不定式结构。结合选项，故答案选B。