单项选择题

There was nothing ______ we could do to prevent the accident.

A．which
B．what
C．that
D．as
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单项选择题
Paul is a very ______ character; he is never relaxed with strangers.
A．self- conscious
B．self- confident
C．self- serving
D．self- satisfied
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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