单项选择题

When you drive home, you can't be______ careful.

A. very
B. too
C. so
D. only
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单项选择题
The more you understand your computer, the______it is that you will find out the problems before they occur.
A. more probably
B. more possibly
C. more likely
D. much likely
单项选择题
______they invite you to speak, remain silent.
A. Even though
B. Though
C. If
D. Unless
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