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

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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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