The young trees should as often as possible.A. take care ofB. be take care ofC. be taken c

问题补充：

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

答案：

A. take care of

B. be take care of

(答案→)C. be taken care of

D. be taken care

解析：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。