The serious problem ____ mankind now is how to protect the e

The serious problem ____ mankind now is how to protect the environment effectively.
A.faces B.facing C.is faced with D.to face

萧晓玉 1年前已收到2个回答举报

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hiy9097c 幼苗

共回答了18个问题采纳率：100% 举报

B,分词短语做后置定语

1年前

4

无言无畏幼苗

共回答了181个问题举报

B对 The serious problem facing mankind 是动名词的复合结构

1年前

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