问题补充：
—Why wasn John hired for the job?
—I don know, but he .
A. was
B. had been
C. should have
D. should have been
答案：
A. was
B. had been
C. should have
(答案→)D. should have been
解析：D 考察情态动词和省略。句义：—为什么John没有被录用？—不知道，他本该被录用的。Should have done本该做某事，实际上却没有做；故D正确。
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