I've got to go.
我得马上走了。I'd better be going.
我想我该走了。
I must be off now.
我该走了。
I must get going now. I've got an appointment at 5 o'clock.
我得走了,我五点钟有约会。
Got to be going, I'm afraid, or I'll be late at the office.
我该走了,不然上班会迟到。
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