Not only the switches but also the old wiring ______ changed. A. have B. are C.
Not only the switches but also the old wiring ______ changed.
A. have
B. are
C. have been
D. has been
13．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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