There______many birds around here,but now we can't see them any more.

问题描述:

There______many birds around here,but now we can't see them any more.
A.use to B.used to have C.used to be D.are
选择哪项?为什么?

选B
used to 过去(常常)
used to be 过去曾是.
used to have 过去曾有.
D 若改为were也可