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The train should have arrived an hour ago.I wonder what coul

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The train should have arrived an hour ago.I wonder what could have caused the _ .
A.late B.later C.delay D.relay
请问:i wonder what could have caused the delay.怎么翻译?
请问:could have caused ,could have done 不是译作 本应该。(事实上并非如此)
The train should have arrived an hour ago.I wonder what coul
我想知道,是什么导致了Train的推迟