Bothhisparentslooksad . Maybethey_____ what'shappenedtohim. [ ]A.knewB.have knownC.must know D. will know-初中英语-魔方格

◎ 题干

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

[ ]

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

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◎ 解析

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◎ 知识点

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