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
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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
单项选择题
We look forward to ______ you.
A．meet
B．having meet
C．meeting
D．be meeting
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