Don’t complain your teachers doing too much homework because they want you to be the bes

问题补充：

Don’t complain your teachers doing too much homework, because they want you to be the best.

A. to; to

B. to; about

C. about; to

D. about; about

答案：

A. to; to

(答案→)B. to; about

C. about; to

D. about; about

解析：在英文中complain to sb about sth表示向某人埋怨某事，故选B。