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Ａll the passengers would have died of cold and hunger ______for the bus driver.

A had it not been

B had it been

C it had not been

D it had been but

应当选择A。

C、D选项存在语序问题，因为如果不采用倒装，则连词if不可省略；

B选项语意不同；

but for是引导虚拟语气，构成重大干扰项。

chose D

but for构成虚拟语气!

All the passengers would have died of cold and hunger ______ for the bus driver.

A had it not been

B had it been

C it had not been

D it had been but

答案是“A”....had it not been

假如不是这个巴士司机，全车上的乘客都会冻死或饿死了。

The answer is A.

= if it had not been

- an English teacher.

答案是A

这是一个IF引导的条件从句。但是它省落了IF，且用了部分道装。

所以你在理解这个句子时应该仔细去分析它。

它的大概意思是“如果不是大巴司机，所有的乘客都会被冻死和饿死”。