—What a mistake!

问题描述:

—What a mistake!
—Yes.I ______ his doing it another way,but without success.(2011四川卷19)
A.was suggesting B.will suggest C.would suggest D.had suggested
为什么会选A嘞,为什么不选D

表过去一种持续状态
我之前一直在建议他换种方式