Was it when he returned he was caught in a snowstorm?
| A．where | B．when | C．that | D．how |
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As the twentieth century, come to a close, the raw. materials for a great national literature were at hand, waiting_______.
| A．to use | B．to be used | C．to have used | D．to be using |
With the help of high technology, more and more new substances____in the past years.
| A．discovered | B．have discovered | C．had been discovered | D．have been discovered |
—You speak very good French! 
—Thanks. I __________ French in Sichuan University for four years.
| A．studied | B．study | C．was studying | D．had studied |
—Why don’t we choose that road to save time? 
—The bridge to it __________.
| A．has repaired | B．is repaired |
C．is being repaired | D．will be repaired |
---It’s very kind of you, but I have a much late in the office. I overslept this morning because my morning clock _______.相关知识点
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