Whendifferent cultures we often pay attention only to the differences without noticing th

问题补充：

Whendifferent cultures, we often pay attention only to the differences without noticing the similarities.

A. compared

B. being compared

C. to compare

D. comparing

答案：

A. compared

B. being compared

C. to compare

(答案→)D. comparing

解析：考查时间状语从句，当主从句的主语一致时可以省略从句的主语和be动词，when compared=when we are comparing….，句意：当比较不同的文化时，我们经常只注意不同没注意相似处。选D。