I haven’t found my cell phone yet. In fact, I am not sure( )I could have lost it.
A.正确答案Awhere
B.that
C.which
D.whether
I haven’t found my cell phone yet. In fact, I am not sure( )I could have lost it.
I haven’t found my cell phone yet. In fact, I am not sure( )I could have lost it.
A.正确答案Awhere
B.that
C.which
D.whether