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

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Iamnotsure____therearelivingthingsontheplanetsornot.A.whethereB.whereC.whyD.if我纠结于A与D选项.希望能得到正确答案Iam

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
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

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
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

A

A
whether...or not 连用是固定搭配

A
句中有 or not时只能用whether ,不能用if