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40.---It snowed heavily last night and there must be a lot of snow on Emei Mountain.

---No, we found a little snow, as most of it seemed ______ off the mountain.

    A.to have blown                     B.to have been blown           

    C.to be blown                   D.to be blown

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39.______ is often the case, we have worked out the production plan.

    A.Which        B.When          C.What          D.As

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38.There is no light in the dormitory.They must have gone to the lecture, ______?

    A.didn’t they      B.don’t they       C.mustn’t they     D.haven’t they

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