【題目】_______ are playing an important part is well known to us all.
A.That who
B.Those who
C.Who that
D.Who

【答案】D
【解析】考查主語從句。句意：誰起著重要作用，這是眾所周知的。主語從句缺少引導詞，從句缺少主語，故選D。

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