all London taxis were black, but now you sometimes see other colours. A. At one time B——青夏教育精英家教网—

摘要： 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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_____ 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

_____ 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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