在保护接零系统中，单相三孔插座的工作零线（N）接线孔应与保护零线（PE）接线孔连接在一起。
参考答案：错
--- It’s a shame that you missedthe lecture on the British culture given by Thompson.
--- I _________ it, but I was busy preparing the coming exam.
A．attended
B．had attended
C．would have attended
D．would attend
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