求助!有道英语习题不会做!the Greeks thought that the bones__griffin bones.A. can be B.mustn't be c.had to be D.must be答案是D,请分别解释各个选项!

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求助!有道英语习题不会做!the Greeks thought that the bones__griffin bones.A. can be   B.mustn't be  c.had to be  D.must be答案是D,请分别解释各个选项!
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求助!有道英语习题不会做!the Greeks thought that the bones__griffin bones.A. can be B.mustn't be c.had to be D.must be答案是D,请分别解释各个选项!
求助!有道英语习题不会做!
the Greeks thought that the bones__griffin bones.
A. can be B.mustn't be c.had to be D.must be
答案是D,请分别解释各个选项!

求助!有道英语习题不会做!the Greeks thought that the bones__griffin bones.A. can be B.mustn't be c.had to be D.must be答案是D,请分别解释各个选项!
D 表推测
C 表必须是
B 表必须不是
A 可能是

must be 表示猜测。A 也可以选,不过语气没有must强。
mustn't不允许,
had to be .不得不。