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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