I think is necessary us to do something useful to protect the birds.A. this; forB. it; o

发布时间：2020-08-20 15:26:11

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

网友回答

A. this; for
B. it; of
C. this; of
(答案→)D. it;for
解析：考查固定句型。It is+形容词+for sb. to do sth.句中it作形式主语。
以上问题属网友观点，不代表本站立场，仅供参考！