题干
— Will you buy this tie for Dad?
— I have no idea. I don’t know or not the colour matches his new shirt.
A：if
B：that
C：why
D：whether
答案(点此获取答案解析）
D
— Will you buy this tie for Dad?
— I have no idea. I don’t know or not the colour matches his new shirt.
A：if
B：that
C：why
D：whether
则X的化学式为（ ）