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23. There is evidence that solar energy either is now economically competitive with conventional sources of heat ______ so within a few years.
(A) will be or
(B) but will be
(C) or will be
(D) and will be

答案：C
難度： 簡單
1F
Su Chen Cheng 國二下 (2011/06/29)
conventional  習慣的,慣例的
2F
(⁎⁍̴̛ᴗ⁍̴̛⁎) 大一上 (2024/02/07)
either .... or ...... 

Either/or is a word pair used to show a contrast.
When using either/or and neither/nor use a singular verb in the sentence if both the subjects (nouns) are singular, for example, “either my sister or my brother is coming”. 

想說為啥不能用and 


23. There is evidence that solar energy ..-阿摩線上測驗