The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
| A．plant | B．planting | C．to plant | D．to planting |
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The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
| A．plant | B．planting | C．to plant | D．to planting |
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