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I'm afraid two hundred dollars ____ enough .what's more ,a b

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I'm afraid two hundred dollars ____ enough .what's more ,a boy or two ____ needed to finish the task .
A.aren't ; is B.aren't ; are C.isn't ; are D.isn't ; is
老师给的标准答案是D,- -但个人认为C是对的.希望各位给点证据,不要干巴巴的一个答案.
I'm afraid two hundred dollars ____ enough .what's more ,a b
第一空看来你是清楚的:金钱作主语谓语动词用单数.同类用法还有 时间.
第二空or这个连词,应该是就近原则没错.http://baike.baidu.com/view/927207.htm(我又查了一下,的确是.你可以仔细看看)所以用复数形式.
那么,C就是对的.