设指令中形式地址为D，基址寄存器为BX，则基址寻址方式时，有效地址E=（）。
参考答案：（BX）+D
The political situation in Libya will become even worse unless some measures ______.
A．will be taken
B．are taken
C．have taken
D．are to take
— Has your mother finished her paper yet?
— I don’t know; she _______ it this morning.
A．wrote
B．has written
C．had written
D．was writing
