He pretended _____ an important paper when the boss entered.
A．to readB．to be readingC．to have readD．to have been reading
B

試題分析：考查不定式的用法：pretend后面可以接不定式做賓語(yǔ)，pretend to do假裝將要做，pretend to be doing假裝正在做，pretend to have done假裝已經(jīng)做了，句意：當(dāng)老板進(jìn)來(lái)的時(shí)候，他假裝正在看一份重要的文件。選B。
點(diǎn)評(píng)：不定式根據(jù)其發(fā)生的時(shí)間不同以及所處的狀語(yǔ)的不同，可以有一般式、完成式、進(jìn)行式、完成進(jìn)行式，同時(shí)根據(jù)它與邏輯主語(yǔ)的關(guān)系的不同，可以有主動(dòng)式和被動(dòng)式。
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