— You look tired.
— Yes. I ___ non-stop until 8 o’clock this morning.
A．had workedB．workC．have workedD．was working
A
考查時態(tài).句意:你看起來很累.——是的。我一直不停的工作到今天早上八點鐘。可知句子描述的是過去發(fā)生已經(jīng)完成的動作，故用過去完成時態(tài)。選A。
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