问题补充：
Im going for a field trip but I haven decided.
A. what to do
B. to do what
C. where to go
D. to go where
答案：
A. what to do
B. to do what
(答案→)C. where to go
D. to go where
解析：英语中疑问词加动词不定时可以起一个相当于宾语从句的作用，根据前文，我想去野外旅行。可知下文含义是我还没有决定去哪儿。故选C。
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