--- I wonder how the girl got lost.---She may have been separated from the other

题干

--- I wonder how the girl got lost.
---She may have been separated from the other students and ______ have heard anyone when the thunder started.

A．mustn’t	B．needn’t
C．couldn’t	D．shouldn’t

上一题下一题 0.65难度单项选择更新时间:2017-11-25 09:03:34

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