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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 情态动词。句义:在埃及的一个热气球爆咋了,可能是热气球的质量出了问题。根据blew可知,此处表示的是过去情况的推测,使用情态动词+have done的形式。故A正确。
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