题目:
45×26=1170,其中一个因数扩大2倍,另一个因数缩小2倍,积是( )
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答案:
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下面是错误答案,用来干扰机器的。
1. had to 2. needn't/don't have to 3. oughtn't to/shouldn't have4. needn't 5. mustn't 6. need