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(dāng)對(duì)比價(jià)格的時(shí)候，我們要考慮商品的質(zhì)量。這句話是省略句，完整的句子是：When we are comparing prices，we have…，當(dāng)主從句的主語一致的時(shí)候，可以省略從句中的主語和be動(dòng)詞，所以選D。
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