单项选择题

______ to help was a great encouragement to us.

A. Their coming
B. Them coming
C. They coming
D. They come
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单项选择题
Good health enables people to enjoy life and have the ______ to achieve their goals.
A. chance
B. opportunity
C. occasion
D. situation
单项选择题
Every policeman and fireman ______ on the alert.
A. have been
B. was
C. are
D. were
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