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

—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

A. toB. withC. 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。

这个答案应该是对的