It is difficult for us to learn a lesson in life ________ we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |
相关试题
I was told that although these old buildings____ the Ming Dynasty, 
they remained in good condition.
| A． are dated back to | B． dated back to |
| C． date back to | D． have been dated back to |
On Mar.11,2011, an earthquake hit Japan , _____12554 deaths and 15077 missing.
| A．caused | B．to cause | C．causing | D．having caused |
“Something in __ nature” is quite different from “Something in__ universe” or “something in____ space”.
| A．a, a, the | B．x, x, the | C．x , the, x, | D．the , the , x |
The number of people invited
_____ fifty, but a number of them _____ absent for different reasons.
| A．were; was | B．was; was | C．was; were | D．were; were |
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