问题
选择题
The postman comes at 6:30 in the morning, ____ time I am usually fast asleep.
A．when
B．at which
C．which
D．that
答案
答案：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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