标准物质期间核查周期:初中英语选择!

来源:百度文库 编辑:神马品牌网 时间:2024/10/06 09:41:04
-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~~

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.