问题补充：
I don know .Can you tell me?
A. how swim; what to do
B. how to swim ; what to do it
C. how to swim; what to do
D. what to swim; how to do
答案：
A. how swim; what to do
B. how to swim ; what to do it
(答案→)C. how to swim; what to do
D. what to swim; how to do
解析：句意：我不知道怎么游泳？你能告诉我要做什么吗？两个空都是宾语从句，在疑问词引导的从句后面接不定式。How to swim怎么游泳；what to do要做什么；故选C。
