Millie put up some signs ____ for old bikes,_____ she?

题目

Millie put up some signs ____ for old bikes,_____ she?
A asked didnt B asking didn't C asking doesn't D asked doesn't

答案

B
主语有谓语 put up（而且是过去时,put的过去式还是put,过去做的事,张贴告示）,后面ask只能用非谓语形式,现在分词表示主动,signs ask for 告示要求.,（象 a sign read 一个标牌上写着,用主动语态不用被动的）
前面一句是过去时的肯定句,因此后面疑问用 didn't she