单项选择题

My key was missing, I ______ it in the office.

A．should have left
B．must have left
C．could have left
D．need have left
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单项选择题
You'd better ______ the same things all the time.
A．not to eat
B．don't eat
C．not eating
D．not eat
单项选择题
David ______ my cousin for eight years.
A．has been married to
B．has mamed
C．married with
D．has been married
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