题干

With efforts _______ conservation, we may believe that people enjoy a healthy life without the environment around them ________.
A.focused on; sufferingB.focusing on; suffering
C.focused on; being sufferedD.focusing on; suffered
上一题 下一题 0.64难度 单项选择 更新时间:2013-03-04 11:47:18

答案(点此获取答案解析)