单项选择题

The mechanic examined the car engine ______ but could find nothing wrong with it.

A．throughout
B．exactly
C．thoroughly
D．altogether
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单项选择题
She is so sensitive. We dare not play jokes on her ______ she should become angry.
A．unless
B．lest
C．for fear of
D．so that
单项选择题
I ______ several interesting facts about Mexico in that book.
A．came to
B．came into
C．came over
D．came across
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