Turn off the switch anything goes wrong with the machine． [ ] A．so B．when C．unle
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Turn off the switch ________ anything goes wrong with the machine．
[]A．so
B．when
C．unless
D．because
试题答案
答案：B
解析：分析句意可知此处应该是一个引导时间状语从句的连词，故选择B项。句意为：机器出了任何问题的时候，关闭开关。 |