Mike has much difficulty Chinese so he often asks me help.A. to understand withB. under

问题补充：

Mike has much difficulty Chinese so he often asks me help.

A. to understand, with

B. understanding, of

C. to understand, for

D. understanding, for

答案：

A. to understand, with

B. understanding, of

C. to understand, for

(答案→)D. understanding, for

解析：考查句型。have difficulty in doing sth.做某事有困难,in可以省略。Ask sb for help 请某人帮忙。故选D