To complete the project as planned, the workers were busy working all day, only ______ a short rest once in a while.
A．to takeB．to have takenC．having takenD．taking
D

試題分析：當(dāng)分詞做狀語的時(shí)候，如果構(gòu)成分詞的動詞與句子的主語構(gòu)成主動關(guān)系，就使用現(xiàn)在分詞做狀語；當(dāng)二者構(gòu)成被動關(guān)系，使用過去分詞做狀語。如果分詞的動作發(fā)生在謂語動詞之前，就使用分詞的完成式。如果分詞與句子的主語沒有關(guān)系，可以使用狀語從句或者獨(dú)立主格結(jié)構(gòu)。本句中的動詞take與句子主語the workers構(gòu)成邏輯上的主動關(guān)系，故使用現(xiàn)在分詞在句中做伴隨狀語。句義：為按計(jì)劃完成這項(xiàng)工程，工人們都整天忙著工作，只是偶爾休息一下。本題也不需要使用完成式having done。故D正確。
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