The doctor ______his temperature before he_____to his chest.
The doctor ______his temperature before he_____to his chest.
a.has taken;listened b.had taken;listened c.took;had listened d.took;listened
是哪个?为什么呢?
a.has taken;listened b.had taken;listened c.took;had listened d.took;listened
是哪个?为什么呢?
英语人气：604 ℃时间：2020-04-14 00:46:10
优质解答
b,had发生于vt-ed之前.过去完成时发生于一般过去式之前
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