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        1. There are many people downstairs. What do you think ______?
          A.to happenB.happening C.is happenedD.has happened
          D
          考查時態(tài)。句意“樓下有很多人,你覺得發(fā)生什么了?”happen不能用于被動語態(tài);排除C;B項缺少is而不能構(gòu)成現(xiàn)在進行時,排除B;不定式to do不能直接作謂語,排除A。故選D。
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