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

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

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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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