he sat there ( ) a long time without ( )anythingA.for,doing.B,for ,did C,at,doing D,at did

问题描述:

he sat there ( ) a long time without ( )anything
A.for,doing.B,for ,did C,at,doing D,at did

A ,表示一段时间,用for,后面的without是介词,所以应该用动名词形式。

A
for a long time 一段时间
without doing (固定用法)介词后面的动词用分词形式