问题描述：
The young trees required _ carefully.
A.looking after B.to look after
C.to be looked at D.to be looked after
请问选B还是D为什么?
The sentence wants _ once more.
A.to explain B.explaining
C.being explained D.to be explained it
A.looking after B.to look after
C.to be looked at D.to be looked after
请问选B还是D为什么?
The sentence wants _ once more.
A.to explain B.explaining
C.being explained D.to be explained it
问题解答：
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