Question

Great changes __________ in our country since 1978. (take place)

在线等

Answer 1

填 have taken place
since 1978 意思是： 自从1978年以来
这是现在完成时的标志

追问

I __________ my daughter since last month. (hear from)
When I got home, I found that my room __________ breaksintosand a lot of things __________. (steal)

追答

第一题填 ：haven't heard from
hear from 是短暂性动词，和since last month 连用，必须用否定形式。
意思是：自从上个月以来我就没有收到女儿的来信。

第二题填 was broken into 和 were stolen
两个空都用被动语态。
意思是：当我到家时，我发现有人闯入我的房间，很多东西被偷了。