请写出原因1.Dave _____a letter from his friend in America yesterday.A.get B.has got C.received D.accepted2.You_____hand it in at once,you may hand it in tomorrow.A.needn't B.may not C.can't D.must not

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请写出原因
1.Dave _____a letter from his friend in America yesterday.
A.get B.has got C.received D.accepted
2.You_____hand it in at once,you may hand it in tomorrow.
A.needn't B.may not C.can't D.must not

1.--------C.received -------收到
2.-------A.needn't ------不必