单项选择题

The flight was postponed because of technical problems and was finally cancelled last week when a () was discovered.

A、accident
B、defect
C、damage
D、defeat
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The woman did not ask about his family, or()that would embarras him.
A、anything
B、something
单项选择题
()is of some use, even if nothing more than to serve as a negative example.
A、Everybody
B、Everyone
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