正确答案：
C.at 20% off.
如选择B,则后面要跟价格,如：for $20.
A是不可取的,只是搭配的问题.
除定冠词之外,英语的介词是最难学的,只能根据习惯用法强击,到时就熟能生巧了.往往没有“why”可言.
How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项 ,why
How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项 ,why
其他人气：788 ℃时间：2020-05-20 19:21:33
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