Can you tell me learn a foreign language well.A. what toB. how toC. what I canD. how can

问题补充：

Can you tell me learn a foreign language well.

A. what to

B. how to

C. what I can

D. how can I

答案：

A. what to

(答案→)B. how to

C. what I can

D. how can I

解析：考查疑问词的用法。句意“你能告诉我怎样学好外语吗？”what“什么”，常充当宾语；how“怎样”，相当于一个副词的功能。根据句意可知用how，排除A、C；D项是宾语从句，但用的是疑问语序，故排除。故选B。