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They be at home. You see, the door is locked from the outside. A. may B. must C.

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They be at home. You see, the door is locked from the outside. A. may B. must C.

They _____ be at home. You see, the door is locked from the outside.

   A. may                 B. must             C. mustn’t                 D. can’t

试题答案

D