问题

It’s nearly 7 o’clock. Helen _______ come, but let’s wait for her for another 5 to 7 minutes.

A:couldn’t
B:can’t
C:mustn’t
D:may not

正确答案是：

同类题型

There is _______ salt in the bottle.

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What do you think about the new teacher?— _________ the new teacher is an elegant lady, she can be extremely difficult to work with