— Is Jack on duty today?— It ____ be him; it"s his turn tomorrow. [ ]A. must

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— 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

答案

举一反三

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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If the dog hadn"t woken us, we wouldn"t have noticed the fire and it ____ to the house next door. [ ]
A. could spread
B. should have spread
C. would spread
D. might have spread

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