Overthepasthalfcentury,usingchemicalfertilizers
来源:语文精选馆 2.91W
问题详情:
Over the past half century, using chemical fertilizers _____ very common in farming.
A. had become B. became C. has become D. becomes
【回答】
C
知识点:现在完成时及其被动式
题型:选择题
问题详情:
Over the past half century, using chemical fertilizers _____ very common in farming.
A. had become B. became C. has become D. becomes
【回答】
C
知识点:现在完成时及其被动式
题型:选择题