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An average of about 100 emails a week ________(be) received. Such ________(be) the case with Martin at present.
are;is 
考查主谓一致。an average of+可数名词复数时,其后的谓语动词应该用复数;the average of+可数名词复数时,其后的谓语动词则应该用单数。such是指代前面的这样一件事,所以视为单数,故其后谓语动词应该用单数。
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