Mr bush is on time for everything. How ____ it be that he was late for the meeting?

Mr bush is on time for everything. How ____ it be that he was late for the meeting?

题目
Mr bush is on time for everything. How ____ it be that he was late for the meeting?
A. can B. should C. may D. must
是不是当meeting后为问号时就要用can(可能),为句号时就可以用should(竟然)
?到底应该选哪个?
答案
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