My cell-phone  has disappeared. Who       have taken it away?
A．couldB．shouldC．mustD．might
A
考查情態(tài)動詞。句意：我的cellphone不見了，會是誰把它拿走了呢?此處could have done表示“可能做過某事”。should have done表示“本來應(yīng)該做某事(但實際上并沒有做)”；must have done表示“一定做了某事”；might have done表示“也許做了某事”。
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