单项选择题

If no one ______ the phone, they must have gone out for breakfast.

A．answer
B．answered
C．had answered
D．has answered
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单项选择题
His mother works at the market ______ sells vegetable and fruits.
A．where
B．in which
C．at which
D．which
单项选择题
You ______ him out though you were very busy.
A．could have helped
B．must help
C．should have helped
D．ought to help
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