—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is _______ is troubling him.
| A．what | B．which | C．as | D．that |
相关试题
This event not only raised _______ of world hunger, but also raised lots of money to help starving children.
| A．information | B．knowledge | C．instruction | D．awareness |
____________ you may be right, I can’t altogether agree.
| A．While | B．As | C．If | D．Since |
The emergency req
uired that all the tasks _____ at least two days ahead of time．
| A．to complete | B．should complete | C．be completed | D．should have been completed |
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