A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.
A．may have beenB．must be
C．need have beenD．might be
A
Ａ考察 情態(tài)動詞。句義：在埃及的一個熱氣球爆咋了，可能是熱氣球的質(zhì)量出了問題。根據(jù)blew可知，此處表示的是過去情況的推測，使用情態(tài)動詞+have done的形式。故A正確。
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