题目内容

Not until the early years of the 19th century______ what heat is.
A．man did know B．man knew C．didn’t man knowD．did man know
D
略
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--- __________ ?
A．IB．MyselfC．Mine D．Me
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---- _____, but who cared what I asked?
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A．an old man standingB．did an old man stand
C．an old man stood D．stood an old man

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