单项选择题

A ______ is a formal or official agreement made between persons, groups, institutions or states.

A．contract
B．contact
C．contrast
D．contest
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单项选择题
I don't feel like ______ now.
A．to dance
B．dancing
C．dance
D．danced
单项选择题
______ to help was a great encouragement to us.
A．Their coming
B．Their came
C．They coming
D．They come
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