—The room is so dirty. _____ we clean it? "—Of course. [ ]A. Let"s

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—The room is so dirty. _____ we clean it?   "
—Of course.    [     ]
A. Let"s
B. Would
C. Do
D. Shall

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举一反三

You mother looks a bit disappointed. You               have told her the truth.         [     ]
A．should
B．must
C．can
D．will

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A lot of trees _______ in our town.              [     ]
A. should be planted
B. planted
C. are planting

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To make our city more beautiful, rubbish _      _ into the river.          [     ]
A. needn"t be thrown
B. mustn"t be thrown
C. can"t throw

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Could you please _       me the book?             [     ]
A. passed
B. pass
C. to pass

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—Must I hand in my exercise book now?
—No, you _      .             [     ]
A. needn"t
B. can"t
C. mustn"t

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