Mr Wang does what he can us improve our English.A. helpB. helpedC. helpingD. to help

问题补充：

Mr Wang does what he can us improve our English.

A. help

B. helped

C. helping

D. to help

答案：

A. help

B. helped

C. helping

(答案→)D. to help

解析：根据题干，本句的意思是“王老师做了他能做的来帮助我们提高我们的英语。”本句中的what 是does的宾语，he can 是what的定语，当定语是2个词时或2个以上词时，则定语后置。故用to help us improve our English是目的状语。所以本题选D。