问题描述：
he didn`t go to the concert yesterday,did he ____________he was busy studying or the tests all
day 1.no,he didn`t 2.yes,he did 3.no,he did 4.yes,he didn`t
day 1.no,he didn`t 2.yes,he did 3.no,he did 4.yes,he didn`t
问题解答：
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