单项选择题


A．had to
B．mustn't
C．must
D．didn't have to
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单项选择题
A．glassesB．minutesC．drinksD．miles to go
A．glasses
B．minutes
C．drinks
D．miles to go
单项选择题
______ he would have passed the important exam.
A．Had he worked hard
B．Did he work hard
C．Were he to work hard
D．If he worked hard
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