【題目】As a student, we should do everything we can __________ the environment.

A.protectB.to protectC.protectingD.protects

【答案】B

【解析】

句意：為了保護環(huán)境，我們應該做我們能做的一切事情。

考查非謂語動詞。A. protect動詞原形；B. to protect動詞不定式；C. protecting動名詞或現(xiàn)在分詞；D. protects動詞第三人稱單數(shù)形式。本題容易因前面的情態(tài)動詞can誤選A選項，根據(jù)句子結(jié)構，空格前的we can為后置定語，修飾前面的everything，即we should do everything (we can) to protect the environment，情態(tài)動詞can省略了動詞do,空格處應填入動詞不定式作目的狀語。故選B。

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