—He worked out such difficult questions at a very young age. —Oh, he _______a very smart student then [ ]A. could have beenB. should have beenC. might have b-高中英语-n多题

◎ 题干

—He worked out such difficult questions at a very young age.
—Oh, he _______a very smart student then

[ ]

A. could have been
B. should have been
C. might have been
D. must have been

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◎ 解析

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◎ 知识点

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