They decided ______ in the mountains .
问题描述：
They decided ______ in the mountains .
A.hiking B.on hike C.to hike D.on hiking
我觉得c和d都对,选几,为什么,快
可是也有decide on doing sth这个词组
答
选 C
decide to do sth.决定做某事.可是也有decide on doing sth这个词组有 decide on+ n./doing sth.的形式，这里若用 decide on , 该这么说：They decidedon going hiking in the mountains .因为“去远足”是 go hiking.