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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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
单项选择题
There is no doubt ______ he'll come.
A．that
B．whether
C．of
D．about
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