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

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

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

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。