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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

14、A

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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

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