When I try to understand _______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
| A．why it does | B．what it does | C．what it is | D．why it is |
相关试题
Do you know
that with wise men improves your mind?
| A．chat | B．chats | C．chatted | D．chatting |
The house rent is expensive. I’ve got about half the space I had at home and I’m paying________here.
| A．as three times much | B．as much three times |
| C．much as three times | D．three times as much |
--- What happened to your shoes?
--- They want .
| A．to mend | B．being mended | C．mending | D．mended |
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