从a、b、c、d、四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该选项涂黑。
21.at _______ dawn we started, but we didn’t get to our destination after sunset, so we had to feel our way in ______ dark.
a. /, the b. the, the c. / , / d. the, /
22. -- are you familiar with the music?
-- yes. there was a time _______ this kind of music was quite popular.
a. that b. when c. with which d. about which
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