单项选择题

All the children were well mannered and ______ toward the guests.

A．respecting
B．respective
C．respectable
D．respectful
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单项选择题
He ______ another career but, at the time, he didn't have enough money to attend graduate school.
A．might have chosen
B．might choose
C．had to choose
D．must have chosen
单项选择题
Both parties promised to ______ the contract to be signed the following day.
A．keep with
B．tangle with
C．adhere to
D．devote to
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