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13.they started off at about 5 o'clock in the morning.they s

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13.they started off at about 5 o'clock in the morning.they should there by now .a:arrive b:have
been arriving c:have arrived d:be arriving
C have arrived
should have arrived表示本应该到了,按照句意他们五点就出发了,现在按道理应该到了
再问: B D是什么意思
再答: B 他们本应该正在到达 D 他们应该将要到达