Twenty dollars ______ obviously too much to pay for such a small item.

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问题 Twenty dollars ______ obviously too much to pay for such a small item.

选项 A、were
B、are
C、is
D、have been

答案C

解析 本题考查的是主谓一致的用法。复数名词或短语表示时间、价格、数字、度量衡等,它们作为一个单一的概念时,其谓语动词要用单数形式。如:
   (1) 15 miles is a good distance.
   (2) Six times four makes 24.
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