Question

In order to find the missing boy, the young couple            all they can over the past twenty-four hours.

A．do

B．did

C．have been doing

D．had done

Answer 1

C

試題分析：從時(shí)間狀語(yǔ)over the past twenty-four hours可以得知用完成時(shí)，但找的動(dòng)作還很有可能繼續(xù)下去，故使用現(xiàn)在完成進(jìn)行時(shí)。句意：為了找到那個(gè)失蹤的男孩，那對(duì)夫婦在過(guò)去24個(gè)小時(shí)里盡一切所能在找。
點(diǎn)評(píng)：時(shí)態(tài)是高考常考內(nèi)容。時(shí)態(tài)題的考查要注意關(guān)鍵詞，同時(shí)要注意具體語(yǔ)境。
即學(xué)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