Richard came home at midnight,______which time all the guests had left.

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问题 Richard came home at midnight,______which time all the guests had left.

选项 A、after
B、by
C、to
D、during

答案B

解析 理查德午夜回家时,所有的客人已经离开了。by which time定语从句,“到那时”。at midnight是一个时间点,during“在…期间”不符合题意。
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