18．Mr．Yang was reading his book in the office，completely            to the world．（　　）
A．losingB．having lostC．lostD．to lose

分析 楊先生正在辦公室里看書，完全迷失在書籍的世界里．

解答 答案：C 句中有逗號分隔，沒有連詞，要用非謂語動(dòng)詞；be lost to迷失在，沉浸在．故選C．

點(diǎn)評 過去分詞是非謂語動(dòng)詞的一種，用法很靈活，分為簡單式done（表示與謂語同時(shí)或幾乎同時(shí)發(fā)生的動(dòng)作）；完成式having been done（表示先于謂語的動(dòng)作）．學(xué)習(xí)時(shí)，要把握其用法特征：表示被動(dòng)和完成．同時(shí)還要注意區(qū)分現(xiàn)在分詞和不定式．

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