How long do you suppose we applied for the job we had been trained .
A. has it been since ; for which
B. is it before ; in which
C. it is when ; that
D. it is since ; for which
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A. has it been since ; for which
B. is it before ; in which
C. it is when ; that
(答案→)D. it is since ; for which
解析：第一空考查语序问题，do you suppose是插入语，在疑问句中疑问句是陈述句语序，答案在CD里面选，考查句型是It is+一段时间+since…., 自从…有多久了。第二空填for which引导定语从句，修饰the job，句意是：你认为我们申请受过训练的工作要多久。选D。