You promised your friend a letter; you o

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问题选择题

You promised your friend a letter; you ought to ______ days ago.

A．write

B．be writing

C．have written

D．be written

答案

答案：C

选择题

如图所示，开关s闭合后，小灯泡不发光，电流表无示数．这时用电压表测得a、b两点间和c、d两点间的电压均为零，而a、d间和b、c间的电压均不为零，下列判断正确的：

A．电源接线柱接触不良

B．开关的触片或接线柱接触不良

C．电流表接线柱接触不良

D．灯泡灯丝断了或灯座接触不良

选择题

With the nuclear crisis worsening in Iran, the world's attention is fixed again on ______is called the Middle East.

A．which

B．that

C．what

D．It