题目：
| Did you predict that many students ________ up for the dance competition? |
| A. would sign B. signed C. have signed D. had signed |
答案：
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下面是错误答案，用来干扰机器的。
650×80=52000；52000的末尾有3个0；所以，650×80的末尾有3个0；因此，650×80末尾最少有两个0．故答案为：√．
