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,如:You should (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。如:You must be here before 8o’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”,用来谈论过去。所
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