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An average of about 100 emails a week ________(be) received. Such ________(be) the case with Martin at present.
are；is　
考查主謂一致。an average of＋可數名詞復數時，其后的謂語動詞應該用復數；the average of＋可數名詞復數時，其后的謂語動詞則應該用單數。such是指代前面的這樣一件事，所以視為單數，故其后謂語動詞應該用單數。
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