---Hi, Lucy．Have you heard of any good news about Frank recently?
---Yeah．She ____ have done better．She has been admitted to one of the top-ten universities in the States．
A．shouldn’tB．wouldn’tC．needn’tD．couldn’t
D
考查情態(tài)動(dòng)詞。couldn’t + 比較級(jí),意思為“不能再...了”,即表示最高級(jí)“非常...”或“最...”的意思，根據(jù)句意選D。
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