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How long do you suppose ______ we applied for the job ______

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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
D

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。