单项选择题

The passage recommends those dealing with computers to ______.

A．be reasonably doubtful about them
B．check all their answers
C．substitute them for basic thinking
D．use them for business purposes only
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单项选择题
—The window is dirty.—I know. It______ for weeks.
A．hasn't cleaned
B．didn't clean
C．wasn't cleaned
D．hasn't been cleaned
单项选择题
Mary said that she ______the cold for several days and still couldn't get rid of it.
A．had had
B．had caught
C．has caught
D．caught
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