摘要：28．Not until the early years of 19th century what heat is. A. man did know B. man knew C. didn’t man know D. did man know
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Not until the early years of 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.
|
A．man did know |
B．man knew |
C．didn’t man know |
D．did man know |
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Not until the early years of the 19th century _________．
- A.man did know heat is what
- B.man know what is heat
- C.did man know what heat is
- D.didn’t man know heat