1. He is supposed     (arrive) an hour ago,but he hasn't turned up by now.

1. to have arrived表示"本應(yīng)該做某事而實(shí)際上卻沒(méi)有做”時(shí)用be supposed to have done sth結(jié)構(gòu)。此句表達(dá)他一小時(shí)以前就應(yīng)該到了,故用to have arrived。

題目來(lái)源:2015年全品作業(yè)本高中英語(yǔ)必修1外研版 > Module 5 A Lesson in a Lab

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