游客
题文

Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.

A.why B.how C.unless D.where
科目 英语   题型 单选题   难度 容易
知识点: 从属连词
登录免费查看答案和解析
相关试题

The development of industry has been ______ gradual process throughout ______ human existence, from stone tools to modern technology.

A.不填;the B.the;a C.a; 不填 D.a; a

We should get prepared for dealing with ________problems_________.

A.any, arise B.which, are arisen C.whatever, arise D.what, are arisen

---You’ve read the Frog by Moyan , haven’t you?
---Yes, I_______ second time and I got a better understanding.

A.have read a B.had read the C.will read the D.read a

We’ll never forget this terrible accident and the damage_______ has caused to the area.

A.that B.what C.it D.one

--- You ought to have given them some advice.
--- , but who cared what I asked?

A.I ought to B.So I ought C.So it was D.So I did

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号