An expert was to give a speech on how to learn English well.A. brought inB. brought onC.

问题补充：

An expert was to give a speech on how to learn English well.

A. brought in

B. brought on

C. brought out

D. brought up

答案：

A. brought in

B. brought on

C. brought out

D. brought up

解析：句意为“专家被请来，就如何学好英语发表演讲”。