单项选择题

The protection device can eliminate the faults ______ they cause more damage.

A. unless
B. until
C. before
D. although
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单项选择题
Despite the wonderful acting and well-developed plot the ______ movie could not hold our attention.
A. three hours
B. three-hour
C. three hours'
D. three hour's
单项选择题
—This ______ John's car. Its number is AC506. —I don't think so. He said it is a small white car but this is a small yellow one.
A. can't
B. must be
C. may not be
D. should be
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