..50分1._______,he sat up late preparing the opening speech f

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..50分
1._______,he sat up late preparing the opening speech for Auto Shanghai 2007.
A.as he was tired B.tired though was he C.tired as he was D.it is because he was tired
2.his interest is flying.when studying at Yale University,he _____ set up the Yale Fying club
A.has helped B.had helped C.helped D.was helping
请说明原因,

1.虽然他很疲劳了,但仍熬夜赶写2007年上海汽车展开幕式上的演话稿.
答案：C.tired as he was
2.他的兴趣是飞行.他在耶鲁大学读书期间,他帮助建立了耶鲁飞行俱乐部.
答案：C.helped
这里时态要保持一致,因为是在耶鲁读大学期间,过去时态,所以后面的help也要用过去时态,尽管前面说的是他的爱好为一般现在时态

..50分1._______,he sat up late preparing the opening speech f --- He got up so late because he sat up too late, preparing He stayed up late last night,_______(prepare) a long speech Some students stayed up late ,preparing for the coming exami He is busy preparing for the speech,so he cann’t help_____th He made a?opening speech yesterday. He worked late into the night,prepared a long speech. I stayed up late until m-- preparing for the job interview.（ He stayed up late last night,___ a speech for his boss.A.to Jim was late for the meeting.He got up late. he got up late,so he miss the early bus he got up late ,so h The failure was due to _______ he hadn't been preparing prop