— They ____ have prepared for the meeting more carefully.— But they didn"t. What

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— They ____ have prepared for the meeting more carefully.
— But they didn"t. What a pity![ ]
A. shouldn"t
B. can"t
C. may
D. ought to

答案

举一反三

— Is Jack on duty today?
— It ____ be him; it"s his turn tomorrow. [ ]
A. must"s
B. won"t
C. can"t
D. needn"t

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The traffic is heavy these days. I ____ arrive a bit late, so could you save me a place?[ ]
A. can
B. must
C. need
D. might

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— Can I get out in the daytime?
— No. The school rules state that no child ____ be allowed out during the day, unless accompanied by an adult. [ ]
A. shall
B. need
C. will
D. can

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— The terrible accident is under investigation.
— Actually, quicker action ____ those workers trapped in the mine. [ ]
A. might have saved
B. must have saved
C. ought to have saved
D. should have saved

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For the engine to work, the green button ____ be in the "on" position.[ ]
A. can
B. would
C. must
D. might

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