18．---Why haven't you handed in your experiment report yet？
---I'm sorry．I had no time for it because I _____ my grandfather in hospital all day．（　�。�
A．took care ofB．take care of
C．was taking care ofD．had taken care of

分析 --你為什么尚未交上你的實驗報告？
--抱歉．我沒有時間寫，因為我整天在醫(yī)院照料我祖父．

解答 答案是C．本題考查過去進行時；過去進行時表示"過去某一時間或某一段時間內(nèi)在進行的動作"；根據(jù)語境可知，作者現(xiàn)在不在醫(yī)院照料祖父，故推斷"整天在醫(yī)院照料祖父"是過去一段時間內(nèi)"在進行"的動作，故用過去進行時，答案是C．

點評 對時態(tài)的選擇，要在把握時態(tài)的基本用法的基礎上，根據(jù)具體語境和題干中的時間推斷時態(tài)，同時關注特殊的結構．

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