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
人气：365 ℃ 时间：2020-04-09 18:19:50
解答
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BD是什么意思B 他们本应该正在到达D 他们应该将要到达
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