问题

I think is necessary us to do something useful to protect the birds.

A: this; for
B:it; of
C:this; of
D:it; for

正确答案是：

同类题型

A true friend will never ________ from you when you’re in trouble.

Good food，good sleep，noexercise．Th

__you the truth, she knows nothingabout it.

When you phoned me,I was having a meeting,otherwise I_______your call.

____ mountains surrounding our village are turning much greener, they have become ________ home to a large number of wild animals