People in China used to keep records by putting a number of stones together, ___
题型：不详难度：来源：
People in China used to keep records by putting a number of stones together, ___?| A．usedn’t they to | B．did they | C．used to they | D．didn’t they |
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答案
| D |
解析
| 反意问句中陈述部分谓语是used to ,是过去式，所以简短问句中要用didn"t (they)。 |
举一反三
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