In the busiest season the peasants were seen ___ their tractors ___from morning till night.
| A．have, work | B．have, working | C．to have, working | D．to have, be worked |
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In the busiest season the peasants were seen ___ their tractors ___from morning till night.
| A．have, work | B．have, working | C．to have, working | D．to have, be worked |
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