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12、Everybody felt shocked the moment a police officer entered the classroom. You        a pin drop.

A.could have heard                                        B.would hear

C.were hearing                                              D.should have heard

12、A

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Everybody felt shocked the moment a police officer entered the classroom. You        a pin drop.

A.could have heard                                        B.would hear

C.were hearing                                              D.should have heard

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