An average of 3 ,000 letters a month______received by the newspaper’s office.A、a

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问题 An average of 3 ,000 letters a month______received by the newspaper’s office.

选项 A、are
B、is
C、was
D、be

答案 A

解析主谓一致题。“an average of+名词复数”作主语时，谓语动词要求使用复数形式，因此A正确。

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Anaverageof3,000lettersamonth______receivedbythenewspaper’soffice.A、a