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17．If there"s a lot of work          ，I'd like to keep on until it is finished．（　　）
A．doB．to doC．doneD．doing

分析 如果還有工作要做，我愿意堅(jiān)持直到結(jié)束．

解答 分析句子結(jié)構(gòu)可以知道，本題考查的是非謂語動(dòng)詞的用法，在這里to do不定式作后置定語，故選B．

點(diǎn)評(píng) 動(dòng)詞的基本用法是作謂語．當(dāng)句中已經(jīng)有了謂語動(dòng)詞了，要選或要填的動(dòng)詞就只能用非謂語形式了．非謂語形式有三種：1、動(dòng)詞不定式：to do  2、動(dòng)詞的ing：doing  3、動(dòng)詞的過去分詞：done，在解決此類題目時(shí)，一定要找出動(dòng)詞的位置，再就是熟記一些固定搭配．

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