【題目】The scientists have ________ the environment.

A.make contributions to protect

B.made contributions to protecting

C.made a contribution to protect

【答案】B

【解析】

句意:科學(xué)家們已為保護(hù)環(huán)境做出貢獻(xiàn)。

考查現(xiàn)在完成時(shí)和固定詞組。根據(jù)句子結(jié)構(gòu),可知此句為現(xiàn)在完成時(shí)have done sth,排除A;此處to為介詞,后接名詞或動名詞,為……做出貢獻(xiàn)make contributions/a contribution to sth/doing sth。故選B。

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