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There was a time in Chinese history_____we had to use foreign oil.

A. when  
B. that
C. which  
D. as
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科目：高中英語 來源：同步題 題型：單選題

There was a time in Chinese history________we had to use foreign oil.
[     ]
A．when  
B．that
C．which  
D．a(chǎn)s

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