Everyone should make a contribution         the environment.
A．to protectB．to protectingC．protectsD．protected
B
考查非謂語動(dòng)詞.句意:每個(gè)人應(yīng)該為保護(hù)環(huán)境做出一份貢獻(xiàn).make a contribution to doing sth表示全力一赴做某事,to是介詞后面接名詞或者動(dòng)名詞作賓語,動(dòng)名詞表示抽象動(dòng)作,故選B.。
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