We did nothing but sit/to sit in the chair,looking/to look at the mountains.请说明选择的原因
问题描述：
We did nothing but sit/to sit in the chair,looking/to look at the mountains.请说明选择的原因
答
不用加TO的, 这是一个表达法.
答
We did nothing but sit in the chair,looking at the mountains.
but+do looking at是伴随壮语