—I am trying my best to learn English but it doesn’t work well!—Don’t worry! Regard it a

问题补充：

—I am trying my best to learn English, but it doesn’t work well!

—Don’t worry! Regard it a big challenge!

A. to

B. with

C. for

D. as

答案：

A. to

B. with

C. for

(答案→)D. as

解析：regard A as B是固定的动词短语结构，意思是“把...认为”、“把...看作”，，所以选D。