What ___________ the date?[ ]
A. is
B. are
答案：A
We were about to go outing______ it began to snow heavily.
A．when
B．while
C．as
D．until
上海证券交易所国债买断式回购交易的券种和回购期限由( )确定。
A．上海证券交易所B．中国人民银行C．交易双方协商D．同业中心
