核心问题
“What do you need?”“Two dollars ____ all I need.” A. being B. is C. have been D. are E. that(TOEFL 教程)
答案规定选 B, 我不明白为什么不能选 D。
词典解答
在表示一笔钱时,把名词短语看作是一个整体,故动词通常用单数:
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Only £ 200 was spent. (在概念上表示 that amount) 仅仅花了 200 英镑。
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Ten dollars is all I have left. (CGEL) 我只剩下十美元。
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Five hundred dollars is required as a down payment. 分期付款的首次付款需要 500 美元。
这个内容是托福等考题经常考核的一个项目：
Ten dollars don't buy as much as it used to.
A B C D
[附注]但是,在试题之外,当把金钱看成可分离的众多数目时,动词亦可使用复数形式(见 minutes): Thousands of pounds have spent on the new hospital. 成千上万英镑的钱花在了这家新医院上。