问题补充:
The earth is our home . It well.
A. must be protected
B. should protect
C. need protect
D. need protecting
答案:
(答案→)A. must be protected
B. should protect
C. need protect
D. need protecting
解析:
试题分析: 句意:地球是我们的家。它必须被保护。must be protected必须被保护,should protect应该保护, need protect需要保护, need protecting需要保护;根据语境可知是地球被保护,故选A。