prices , we have to take into consideration the quality of the goods .
A．While comparedB．ComparedC．CompareD．When comparing
D

試題分析：句意：當對比價格的時候，我們要考慮商品的質量。這句話是省略句，完整的句子是：When we are comparing prices，we have…，當主從句的主語一致的時候，可以省略從句中的主語和be動詞，所以選D。
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