—She looks very happy .She ______have passed the exam.--I guess so.It's not difficult after all.A.should B.must C.could D.must参考答案A,为什么B不行?
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![—She looks very happy .She ______have passed the exam.--I guess so.It's not difficult after all.A.should B.must C.could D.must参考答案A,为什么B不行?](/uploads/image/z/4240599-15-9.jpg?t=%E2%80%94She+looks+very+happy+.She+______have+passed+the+exam.--I+guess+so.It%27s+not+difficult+after+all.A.should+B.must+C.could+D.must%E5%8F%82%E8%80%83%E7%AD%94%E6%A1%88A%2C%E4%B8%BA%E4%BB%80%E4%B9%88B%E4%B8%8D%E8%A1%8C%3F)
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