The young trees required _ carefully.

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

The young trees required _ carefully选 A.looking after require doing sth.有被动意义即:这棵小树需仔细照料The sentence wants _ once more.选 B.explaining 同样want doing sth.含被动意义即:这句句子需要再解...