They ensured the old lady that her son ___ back in a few days,but she was still very worried.(come)
问题描述：
They ensured the old lady that her son ___ back in a few days,but she was still very worried.(come)
请选择适当形式填空
答
would come
他们对这个老夫人保证她儿子几天之后就回来了,但她仍然很担心
ensure用了过去时,说明事情发生在过去,而他儿子回来这件事情是相对过去的将来时,所以有will,用其过去时would