Costs have been reduced ___20% over past year. A．inB．onC．toD．by
题型：不详难度：来源：
| Costs have been reduced ___20% over past year. |
答案
| D |
解析
| 考查介词与reduce的搭配。by为减少了多少；to减少到多少；按照句意：过去的一年，各项费用已经减少了20%可知答案。 |
举一反三
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