As a source of Apower, electricity Bhad no rival because it is Cclean, silent, a

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问题 As a source of Apower, electricity Bhad no rival because it is Cclean, silent, and Dcan be turned on and off instantly.

选项 A、
B、
C、
D、

答案 B

解析 Had is past tense; a present-tense verb is needed with the simple present verb is in the second clause. Correction: has.

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