Farmersareallowedtogrowsmallgardensoftheirownandtheyselltheirvegetables__________theblackmarket.
A.on B.at C.in D.for正确答案A
Farmersareallowedtogrowsmallgardensoftheirownandtheyselltheirvegetables__________theblackmarket.
A.on B.at C.in D.for正确答案A