题目内容

The postman comes at 6:30 in the morning, ____ time I am usually fast asleep.
A.whenB.at whichC.whichD.that
B
考查定语从句。句中先行词为at 6:30 in the morning,故用介词at + which。句意:邮寄员每天早上6点半来,那时我通常在熟睡。
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