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Mark has made it clear that he wants his organs donated___an

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Mark has made it clear that he wants his organs donated___anything ever happen to him.
这是一个选择题.A if B unless C had D should
请问大家该选什么呢?并给出你的解释.
Mark has made it clear that he wants his organs donated___an
D.这是一道虚拟语气的题.当if从句表示与将来相反时(这里并不一定发生,所以用虚拟),可用 过去式,should加原形,或were to.这里用的是第二种 should.
另外if虚拟句有should时 可以把 should提前,省略if.
如果选AB.不管意思对不对.anything是第三人称单数,则happen应加s
C.had应与 happened连用.