. --So hard __________ in the past few months that he has made great progress in English.

--I can see that, only a few mistakes he made in this exam.

A．he worked

B．did he work

C．he has worked

D．has he worked

理中丸的功用是（）

A.温中祛寒，补气健脾

B.温中祛寒，和胃止呕

C.健脾益气，养胃和中

D.健脾益气，渗湿止泻

E.温中健脾，和里缓急