[ Modal Verbs ]
. William ________________ complete his assignment on time because he didn’t find the books he needs.
A. isn’t able to
B. couldn’t
C. had better not
D. mustn’t
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(a) one last piece of advice
(b) one last piece of advise
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…… you play the piano?
A. Can
B. Must
C. Should
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Choose the correct word or word pair that completes the sentence.
It _______________ been delayed in another city.
_____
A. must of
B. must have