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单项选择。Both his parents look sad.Maybe they

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问题详情：

单项选择。Both his parents look sad.Maybe they

单项选择。

Both his parents look sad . Maybe they _________what's happened to him .

Ａ. knew Ｂ. have known Ｃ. must know Ｄ know

【回答】

Ｂ

知识点：动词时态

题型：选择题

标签：单项 parents sadMaybe

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