当然选A啦
你看后面有ro not
whether or not才能连用,if没有这种用法的
）
I am not sure ____ there are living things on the planets or not.A.whethere B.where C.why D.if
I am not sure ____ there are living things on the planets or not.A.whethere B.where C.why D.if
我纠结于A与D选项.希望能得到正确答案
我纠结于A与D选项.希望能得到正确答案
英语人气：882 ℃时间：2020-02-04 06:29:10
优质解答
我来回答
类似推荐
- I am not sure ( )there are living things on other plants or not.Even scientists are not sure.
- There are_______living things on the moon.
- we all know the truth()there are air,water and sunlight there are living things.
- could you tell me ( )there are living things on the Moon
- 英语填空.There are m of living things on the earth