Question

An average of about 100 emails a week ________(be) received. Such ________(be) the case with Martin at present.

Answer 1

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。