The soil is becoming poor because farmers here mostly use only one kind of chemical fertilizer for several years________.
| A．in a row | B．on a large scale |
| C．at random | D．to a degree |
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The soil is becoming poor because farmers here mostly use only one kind of chemical fertilizer for several years________.
| A．in a row | B．on a large scale |
| C．at random | D．to a degree |
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