He feels relaxed and even begins to whistle because ________ of the distance ________ covered．

[　　]

A．three fifth; were

B．three fifth; was

C．three fifths; have been

D．three fifths; has been

答案：D
解析：

考查數(shù)詞、語態(tài)、主謂一致。“五分之三”是three fifths；此處是把距離看成一個整體，所以謂語動詞用單數(shù)。


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