The pupils here_____ all kinds of exercises every day in the past few weeks.
| A．keptbusydoing | B．keepondoing |
| C．havekeptbusydoing | D．havebeenkeptbusydoing |
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The pupils here_____ all kinds of exercises every day in the past few weeks.
| A．keptbusydoing | B．keepondoing |
| C．havekeptbusydoing | D．havebeenkeptbusydoing |
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