【高一英语】一道有关语态选择题Recently,however,scientist _______ that long
【高一英语】一道有关语态选择题
Recently,however,scientist _______ that long term use of chemical fertilizers can cause damage to the land and,even more dangerous,to people's health.
A.found
B.have founded
C.have been finding
D.have been founding
为什么要用被动语态?难道科学家是被动发现这个问题的吗?