More and more trees need ___in the world.A.planting B.to plant C.be planting D.be planted

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More and more trees need ___in the world.A.planting B.to plant C.be planting D.be planted

More and more trees need ___in the world.A.planting B.to plant C.be planting D.be planted
More and more trees need ___in the world.A.planting B.to plant C.be planting D.be planted

More and more trees need ___in the world.A.planting B.to plant C.be planting D.be planted
A
need doing=need to be done
主动表被动
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应填A.planting
need后接动名词表示被动,比如This bike needs repairing.相当于This bike needs to be repaired.
因此上句也可说成More and more trees need to be planted...

A