问题
Had it not been for the fact that about 30 pupils__________ in the state of Connecticut a fortnight ago, their parents___________ in deep sorrow now.
A:offering
B:were killed,couldn’t be
C:would havebeen killed, mightn’t be
D:should bekilled, wouldn’t be
B:were killed,couldn’t be
C:would havebeen killed, mightn’t be
D:should bekilled, wouldn’t be
正确答案是：
