标准物质期间核查周期:初中英语选择!
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-May I go now?
-No, you ________.You ________ stay here.
A.needn't;have to
B.needn't;must
C.needn't;have to
D.mustn't;must
理由滴~~
-No, you ________.You ________ stay here.
A.needn't;have to
B.needn't;must
C.needn't;have to
D.mustn't;must
理由滴~~
d
d
d
a,b,c
D.mustn't;must
mustn't表示不准许,禁止,而needn't表示不需要,
must表示必须, 应当语气比have to 强.