【題目】All possible means ________ tried, but not every means ________.

A.have been; workB.has been; worksC.have been; worksD.has been; work

【答案】C

【解析】

考查主謂一致。句意:所有可能的方法都試過(guò)了,但不是所有的方法都有效。第一空有all來(lái)修飾means,所以謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式;第二個(gè)空有every修飾means,所以用單數(shù)。故選C。

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