Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.
| A．make | B．to make |
| C．made | D．making |
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Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.
| A．make | B．to make |
| C．made | D．making |
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