Susan is ______ as an "addlehead"—she always leaves her keys on the door.

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问题 Susan is ______ as an "addlehead"—she always leaves her keys on the door.

选项 A、who is known
B、which is known
C、whom is known
D、what is known

答案D

解析 语法结构。本句中what为关系代词,引导一个名词性从句作表语,表示“……那样的事物”。what is known意为“所谓的,大家所知道的”。在表语从句中,who,whom和which不能既连接从句又充当从句中的主语或者宾语,故不选A、B、C。
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