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：高中英語 來源： 題型：
_____ 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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