20.-----for a long time,but he tried his best to catch up wi

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20.-----for a long time,but he tried his best to catch up with his classmates.
A.Having been ill B.Being ill C.Tough he was ill D.He was ill

D
but是连词,其前后两部分要对等.此例中but后面是一个分句,那么前面也应当是一个分句.如选A就不是分句了,就只是一个现在分词短语了,因为它没有主语,也没有谓语动词.现在分词是“非谓语动词.
同理,B也不能选.
but不与though连用,排除C.

20.-----for a long time,but he tried his best to catch up wi ____for a long time ,but jim tried his best to catch up with _____for a long tine,but he tired his best to catch up with ____for a long time,but he managed to catch up with his clas he is a little weak in this but he tried his best to catch u He is a little weak in this ,but he has tried his best to ca He tried his best to quit smoking but he failed.这个句子对吗?为什么 His school bought computer time for a year,but he used it up he tried his best to save the drown girl,but unfortunately s 翻译he tried to catch the bus but was a little too late. He tried his best to find a p___ word to express his feeling Busy ( ) he was,he tried his best to help you.A.as B.when C.