问题详情:
Over the past half century,________ chemical fertilizers has become very common in farming.
A. having used B. use C. used D. using
【回答】
D
知识点:非谓语动词
题型:选择题
问题详情:
Over the past half century,________ chemical fertilizers has become very common in farming.
A. having used B. use C. used D. using
【回答】
D
知识点:非谓语动词
题型:选择题