—Why wasn't John hired for the job?
—I don't know, but he .
A. was
B. had been
C. should have
D. should have been
网友回答
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。