进行上证50ETF、申购、赎回操作的投资者需具有上海证券交易所( )。
A．A股账户
B．B股账户
C．基金账户
D．专门账户
参考答案：A
He _______to get some cards for his birthday,but none arrived. [ ]
A. promised
B. expected
C. thought
D. supposed
A．I= ，从上向下
B．I= ，从上向下
C．I= ，从下向上
D．I= ，从下向上
