题一: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
题二:not until i began to work how much time i had wasted.
a. didn’t i realize b. did i realize
c. i didn’t realize d. i realize
题三:not once their plan.
a. did they change b. they changed
c. changed they d. they did changed
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