单项选择题


A．would have left
B．have left
C．could have left
D．to take it out
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单项选择题
A．whatB．thatC．howD．why
A．what
B．that
C．how
D．why
单项选择题
A．mustB．hadC．mayD．ought
A．must
B．had
C．may
D．ought
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