以下（）不是集中式国际结算业务系统（GTS）的业务功能。
A.购汇
B.进口信用证
C.出口托收
D.保函
参考答案：A
By 2013, cases of AIDS had been reported in Harbin, thus _____ AIDS a provincial concern.
A．to make
B．making
C．having
D．made
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