问题

If you try to understand _____ that prevents so many Americans from being as happy as one might expect, it seems that there are two causes. [ ]

A: what it does
B: why it is
C: why it does
D: what it is

正确答案是：

同类题型

Let’s learn to use the problem we are facing now _______ a stepping-stone to future success.

Reading articles like that, if, will do harm to you [ ]

To be frank, I don’t think the carpets and curtains in your room _____ well. [ ]

______ made things worse, Peter said, was that hisparents stopped supporting him in developing the “flying car”.

I’m afraid MrWood can’t see you until 4 o’clock.— Oh, _______ I won’t wait[ ]