Not until the early years of the 19th century what heat is. A．didn’t man know B．did man know——青夏教育精英家教网—

摘要：Not until the early years of the 19th century what heat is. A．didn’t man know B．did man know C．man did know D．man knew

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Not until the early years of the 19th century______ what heat is.

A．man did know

B．man knew

C．didn’t man know

D．did man know

Not until the early years of the 19th century______ what heat is.

Not until the early years of the 19th century ________ what heat is.

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Not until the early years of the 19th century ________ what heat is.

[　　]

Not until the early years of the 19th century ________ what heat is.

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