I don't think she could have done such a stupid thing yesterday, _____?
A．do IB．could sheC．did she D．has she
C
考查反意疑問句。根據(jù)yesterday可知，could have done是對過去動作的推測，故用過去時；情態(tài)動詞表示推測，反意疑問句不用情態(tài)動詞，故答案選C。
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