问题
It should be emphasized that our technology has great potentials ________ food development in China
A:since
B:when
C:if
D:before
B:when
C:if
D:before
正确答案是：
同类题型
The price ________, but I doubt whether it will remain so
A new pen for me by my aunt tomorrow.
What has made you so happy，Mary?-Oh，I’ve just________an old friend I haven’t seen for years.[ ]
Can I help you–Yes, I want _________.
Ma Yun, the chairperson of Alibaba Group, has made much money the Internet.