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．watchingB．waiting forC．servingD．searching
A．watching
B．waiting for
C．serving
D．searching
单项选择题
A．glassesB．minutesC．drinksD．miles to go
A．glasses
B．minutes
C．drinks
D．miles to go
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