-般保证未约定保证期限间地,保证期限间为主债务履行期限届满之日起()。(担保法第25条)
A.3个月
B.6个月
C.180天
D.90天
参考答案:B
I think you probably know China has adopted a flexible policy( )her foreign trade.
A. on B. withC. in D. under