一道英语选择,These trees must have been planted three years ago,____?A weren't they B must't theyC didn't they D haven't they

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一道英语选择,These trees must have been planted three years ago,____?A weren't they B must't theyC didn't they D haven't they

一道英语选择,These trees must have been planted three years ago,____?A weren't they B must't theyC didn't they D haven't they
一道英语选择,
These trees must have been planted three years ago,____?
A weren't they B must't they
C didn't they D haven't they

一道英语选择,These trees must have been planted three years ago,____?A weren't they B must't theyC didn't they D haven't they
A.首先,must在这里表示猜测,相当于虚拟语气.不看后面的话A,C均可.但树是被种的,所以要用被动.所以只能选A.

A,要用被动语态。

c,过去完成的事情

A.首先,must在这里表示猜测,相当于虚拟语气。不看后面的话A,C均可。但树是被种的,所以要用被动。所以只能选A。
望采纳,我谢谢你啦!
我是先到者!!!!!!!!!!!!!真的