—Are we going on a field trip to Minghu Lake by bus?— Yes but the teacher didn’t say .A.

问题补充：

—Are we going on a field trip to Minghu Lake by bus?

— Yes, but the teacher didn’t say .

A. where to go B. when to go C. how to go

答案：

解析：疑问词和动词不定式连用充当某一句子成分。在本题中充当宾语。