An average of 200 letters a week______received by the newspaper’s office.

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问题 An average of 200 letters a week______received by the newspaper’s office.

选项 A、are
B、has been
C、have been
D、is

答案A

解析 “an average of+复数名词”作主语与复数动词连用,所以排除B、D。根据时间状语aweek“每周”,选A。
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