They had been up since five o 'clock that morning, as the reader will remember; but bah!
我们记得，他们是在早晨五点起身的，但是，没有关系！
He has rung me five times since 12 o 'clock.
从12点钟起，他已经给我打了5次电话了。
He has rung me up five times since 12 o 'clock.
从12点以来他已经给我打了5次电话。
I have been reading the newspaper since five o 'clock.
我从5点钟开始一直在读报。
I have been reading the newspaper since five o 'clock.
我从5点钟开始一直在读报。
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