问题补充:
prices , we have to take into consideration the quality of the goods .
A. While compared
B. Compared
C. Compare
D. When comparing
答案:
A. While compared
B. Compared
C. Compare
(答案→)D. When comparing
解析:句意:当对比价格的时候,我们要考虑商品的质量。这句话是省略句,完整的句子是:When we are comparing prices,we have…,当主从句的主语一致的时候,可以省略从句中的主语和be动词,所以选D。