It was an easy test and he should have passed ,but he___A doesn't B wasn't C didn't D hadn't

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It was an easy test and he should have passed ,but he___A doesn't B wasn't C didn't D hadn't
It was an easy test and he should have passed ,but he___
A doesn't B wasn't C didn't D hadn't

It was an easy test and he should have passed ,but he___A doesn't B wasn't C didn't D hadn't
C
should have passed 是个对过去发生的事的虚拟语气,所以要用过去时