6. I can't find my books. I'm sure I must        on the bus. (leave)

我找不到書了，我確定我準(zhǔn)是把它們忘在公汽上了。

6. have left them對已發(fā)生動作的肯定推測用must have done表達(dá)。

題目來源：高考英語組合訓(xùn)練多項選擇+完成句子 > 組合訓(xùn)練49-50

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