问题

I’m sure our surroundings will become better. — It is still a problem _____ we can control the pollution. [ ]

A: that
B: whether
C: if
D: why

正确答案是：

同类题型

Walk ______ the house, and you’ll see a big tree onyour left.

下列各句表达得体的一项是（）

I’ve applied for the job but I’m not very ________ about my chance of getting it.[ ]

Why is our head teacher here What happened–Don’t be nervous. There is ___________.

Jenny’s teeth are not good, because she____.