单项选择题

I ______ two hours on this math problem.

A．spent
B．paid
C．cost
D．taken
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单项选择题
Not until the early years of the 19th century ______ know what heat is.
A．did man
B．man did
C．have man
D．man have
单项选择题
I had told them the reason, ______ I didn't attend the meeting.
A．why
B．for which
C．that
D．which
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