Question

The young trees should______ as often as possible.

A．take care of	B．be take care of
C．be taken care of	D．be taken care

Answer 1

C

试题分析：这些小树应该尽可能的受到经常的照顾。结合语境可知句子主语是动作对象，故用被动语态。选项B需变成过去分词，选项D缺少介词of。故选C。
点评：此类题型主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态，反之如果是动宾关系，则用被动语态。