单项选择题

______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

A. To wait
B. Waiting
C. Having waited
D. To have waited
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单项选择题
John got the first prize in the Math contest, ______ made his parents very happy.
A. what
B. which
C. that
D. this
单项选择题
The government must take some measures ______ the city's pollution.
A. to control
B. controls
C. controlling
D. to be controlled
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