He sat there for a long time w___ doing anything

without
他坐在那里什么也没做很长时间了!
额外语言点：
prep.无；没有
not having;not carrying
· You can't buy things without money!
没钱就买不了东西!
· He came in without being asked.
他未经允许就进来了.
· We could not live without air.
没有空气我们就不能生存.
· without doubt
毫无疑问
· without fail
必定,务必
· without price
贵不可言
· go without saying that
毫无疑问
· work without food or rest
没吃没歇地干

without