You_all the trouble had you know she has not there.A.mustn't take B.needn't take C.mustn't have t
问题描述：
You_all the trouble had you know she has not there.A.mustn't take B.needn't take C.mustn't have t
aken D.needn't have taken
答
D 虚拟语气 needn't have done "本没有必要做（但实际上做了）"
had you known =if you had known 表事情发生在过去