—Tom graduated from college at a very young age.—Oh,hehave been a very smart boy then.A. c

发布时间：2020-08-17 04:16:46

—Tom graduated from college at a very young age.
—Oh,he    have been a very smart boy then.
A. could
B. should
C. might
D. must

网友回答

A. could
B. should
C. might
(答案→)D. must
解析：考察情态动词用法。Could have done本可以做某事，实际上却未做；should have done本应该做某事，实际上却为做；might have done也许做了某事；must have done一定做了某事；句意：—Tom很小的时候就大学毕业了。—啊！他一定是一个很聪明的学生。根据句意说明D正确。
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