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.to plan | B.to planting | C.plant | D.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.to plan | B.to planting | C.plant | D.planting |