单项选择题

After ______ on his couch more than a dozen times, he gave up his attempt to sleep.

A. he overturned
B. his having turned over
C. turning over
D. turning up
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单项选择题
When we make friends all of the following factors should be considered except ______ according to the passage.
A．appearance
B．social status
C．facial expressions
D．salary
单项选择题
The number of refereeing errors in the experimental match was ().

A. slightly above average
C. quite unexpected
B. higher than in the 1998 World Cup
D. as high as in a standard match
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