因晴天多，阳光灿烂，有“日光城”之称的城市是[ ]
A．乌鲁木齐
B．兰州
C．西宁
D．拉萨
答案：D
I received his mother’s telephone call at eleven.＿＿that he was badly hurt in an accident yesterday.
A．Then did I know
B．Only then I knew
C．Only then did I know
D．Only then knew I
债券质押式回购交易的标准券是一种非虚拟的回购综合债券。( )
