19.________，you can’t lift the heavy box up.

　　A．Even you are strong

　　B．Strong as you are

　　C．How strong you are

　　D．As you are strong

　　解析：选B。考查让步状语从句。根据句意“你虽然健壮，但举不起那个沉重的箱子。”可知，该空应用让步状语从句，排除A、C；又因as引导让步状语从句时，需用倒装，故选B。

　　②【教材原句】　By the time the Challenger took off in 1986, the world seemed to have lost its fear and wonder at the amazing achievement of people going up into space.(P58)

　　到1986年，“挑战者”号飞行的时候，人们似乎对于人类进入太空一事已失去了最初的恐惧和好奇心了。

　　【句法分析】　sb.seemed to have done sth.某人似乎做了某事，不定式完成式时表示动作发生在过去或已经完成。此结构可以改为“It seemed that sb. had done sth.”seem还有以下用法。

　　(1)seem＋(to be)＋表语(adj.或n.或prep.)

　　(2)seem＋to do

　　(3)It seems＋that－clause

　　(4)It seems like...

　　(5)It seems as if...

　　(6)There seems to be...

　　(7)It seems so.

　　①She seemed to have known about the news.

　　＝It seemed that she had known about the news.

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