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

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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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