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(高三英语)____is to attend our evening.

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(高三英语)____is to attend our evening.
____is to attend our evening.
A.both the singer and the dancer
B.Either the singer or dancers
C.The singer or dancers
D.The singer and dancer答案为D,why?若选B呢?
(高三英语)____is to attend our evening.
因为动词是IS 单数,故主语必须是第三人称单数,只有D对,因为B(EITHER OR 作主语时,是就近原则,即主语是DANCERS复数,故B错