How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项

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How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项

How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项
How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项

How much is this dress It is on sale____20% off.A on B for C at 应填哪个选项
How much is this dress It is on sale for 20% off.

C

for 选B 这件裙子八折
at 选C 这件裙子两折
我觉得哈
还是B要准确一些。