问题详情

Whatarelargebanksinlargecitiesengagedinbesidessupplyingbankdepositservices？
A．Theyareengagedininternationaltrade.
B．Theydosomeparticularbusinesswithforeigners.
C．Theyprovidesomespecificancillaryservices.
D．Theyestablishcorrespondentbanksinsmallcities.

请帮忙给出正确答案和分析，谢谢！