—Is Bob still teaching?
—I’m afraid not. He is said    the school as he has become a businessman.
A．that he has leftB．to leave
C．to have leftD．to be left
C

試題分析：根據(jù)“as he has become a businessman.”可判斷出不定式動(dòng)作leave發(fā)生在謂語動(dòng)詞表示的動(dòng)作之前，故用不定式的完成時(shí)，故選C。
點(diǎn)評(píng)：不定式的完成式表示的動(dòng)作發(fā)生在謂語動(dòng)詞表示的動(dòng)作之前，強(qiáng)調(diào)動(dòng)作的先后順序。
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