问题

__________ we leave the library before 5 o’clock— No, you needn’t. You can stay here until 5:30.
A:Must
B:May
C:Can
D:Could;
B:May
C:Can
D:Could;
正确答案是:
同类题型
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Could you please the radio a bit It’s too loud.— Sorry, I’ll do it right now.