14、_____ all London taxis were black, but now you sometimes see other colours.
A. At one time B. At a time
C. From time to time D. At the same time
科目:高中英语 来源: 题型:
_____ all London taxis were black, but now you sometimes see other colours.
A. At one time B. At a time
C. From time to time D. At the same time
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