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

游客2024-01-02  7

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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