mike said he was thinking about ( )the maths problem at that time .a.which to do b.what to do c.how to do d.why to do选哪个?为什么?

问题描述:

mike said he was thinking about ( )the maths problem at that time .
a.which to do b.what to do c.how to do d.why to do选哪个?为什么?

c.how to do

答案选【C】
宾语从句,翻译如下:
【迈克说他那时候在想怎样做那到数学题】