Not only the switches but also the old wiring _________ changed.

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问题 Not only the switches but also the old wiring _________ changed.

选项 A、have
B、are
C、have been
D、has been

答案D

解析遇到not only…but also的句型时，谓语动词的单复数与靠近它的名词一致。Old wiring是单数，谓语动词为单数。选项D是正确的。句子大意：不光是开关，就连旧的线也换了。

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