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
C

試題分析：從時間狀語over the past twenty-four hours可以得知用完成時，但找的動作還很有可能繼續(xù)下去，故使用現(xiàn)在完成進行時。句意：為了找到那個失蹤的男孩，那對夫婦在過去24個小時里盡一切所能在找。
點評：時態(tài)是高考�？純热�。時態(tài)題的考查要注意關鍵詞，同時要注意具體語境。
即學即練：－Why didn’t you give me a call last night?
－Well, I couldn’t. My phone _____________.
A. was being repaired                    B. had been repaired
C. would be repaired                     D. was repaired
選A
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