题目内容

—Hi,Joan.Any idea where Tom is?
—He ________ on the playground.I saw him there playing football just now.
A.shall beB.should have been
C.must beD.might have been
句意:——嗨,Joan。你知道Tom在哪里吗?——一定在操场上,我刚才看见他在操场上踢足球。must be是对现在状态的肯定推测。 答案 C
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