Her parents______her letter last week. They don’t know what has happened toA、mus

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问题 Her parents______her letter last week. They don’t know what has happened to

选项 A、must receive
B、must have received
C、ought to receive
D、ought to have received

答案 D

解析本题考查情态动词，根据题意，他的父母本该上周就收到她的信，他们不知道她出了什么事；可以知道是对过去本该发生而没有发生的事的推测，所以应该用should／ought to+have+过去分词的句型，D正确；B虽然也是对过去的推测，但意思为"肯定收到了"，所以不合题意。

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