21. 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
答：d。“not until+状语”故在句首时，用倒装句式。
22. 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
答：b。“not until+状语从句’放在句首时，从句不倒装，主句用倒装句式。
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