支付密码在哪些操作中会需要输入？（）
A.确认收货
B.余额付款
C.支付宝内的申请退款
D.网银付款
参考答案：A, B, C
--- Your grandparents were very great.
--- Yes. They supported my father’s schooling _________ they were very poor.
A．as if
B．even though
C．so that
D．what if
