题目内容
Listen, pull the rope ________ you hear the whistle．
[ ]
A．
unless
B．
at once
C．
immediately
D．
at the time
答案：C
解析：
解析：
immediately作连词引导时间状语从句。
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题目内容
Listen, pull the rope ________ you hear the whistle．
unless
at once
immediately
at the time
immediately作连词引导时间状语从句。