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  3. He______in Japan as he left by boat last month.

He______in Japan as he left by boat last month.

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问题 He______in Japan as he left by boat last month.
选项 A、ought to arrive
B、ought to have arrived
C、should arrive
D、must arrive
答案B
解析 ought to do sth和should do sth意为“应该做某事”，多用来提出劝告，例如：Youshould(ought to)go and see Mary sometime．你应该抽时间去看看玛丽。must do sth．用来发出有力的劝告或命令，例如：You must be here before 8 o’clock at the latest．最晚你必须八点以前到这里。根据结构，A、C和D均不合适。ought to have done sth．意为“本应该做完某事”，用来谈论已经发生的事情。例如：She ought to have arrived at her office bynow．她现在本该到办公室了。所以B符合题意，为正确答案。
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