She promised she --do better work.Awould B willC shall D is going to
问题描述：
She promised she --do better work.Awould B willC shall D is going to
答
选A ,前面的promised,表明了时态为过去时,所以后面的宾语从句也要用过去时,所以选A.
这句话的意思是：她承诺过她会做的更好.