问题
Only after _____ did people know it was not an accident, but an attack of some kind.[ ]
A: the second tower of the World Trade Centre was hit
B: did the second tower of the World Trade
C: was the second tower of the World Trade Centre hit
D: the second tower of the World Trade Centre was fallen
B: did the second tower of the World Trade
C: was the second tower of the World Trade Centre hit
D: the second tower of the World Trade Centre was fallen
正确答案是：
同类题型
It is getting dark outside, Tommy. I must be off now.—___________
It was in the factory ________the TV sets were produced________ we met for the first time.
periment turned out to be a completefailure, _____ wasn’t _____ they expected．
n’t seem to be quite yourselftoday, do you —I’m suffering from a cold. Nothingserious, ____.