17．In order to find the missing boy，the young couple            all they can over the past twenty-four hours．（　�。�
A．doB．didC．have been doingD．had done

分析 為了找到那個丟失的男孩，在過去的24個小時里，這對年輕的夫婦傾其所能．

解答 答案為C．根據(jù)時間狀語"over the past twenty-four hours"可知尋找這個動作從過去一直持續(xù)到現(xiàn)在，而"In order to find the missing boy"可知這個男孩還沒有找到．所以答案是C，表示從過去一直到現(xiàn)在且現(xiàn)在還在進行．

點評 考查現(xiàn)在完成進行時．
現(xiàn)在完成進行時，是英語中，動詞的一種基本時態(tài)，其構(gòu)成為：主語+助動詞（have/has）+been+動詞的現(xiàn)在分詞+其他成分．表示動作從某一時間開始，一直持續(xù)到現(xiàn)在，或者剛剛終止，或者可能仍然要繼續(xù)下去．（與since，for連用時，要用連續(xù)性動詞，不可用瞬間動詞，但連續(xù)性動詞常常表示動作會進行下去）
也可以表示某種經(jīng)歷．

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