The old man is very tired,______he's still working hard.A.and B.or C.but D.because

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• The old man is very tired,______he's still working hard.A.and B.or C.but D.because
• The old man is very tired,______he's still working hard.A.and B.or C.but D.because
• The workers felt tired.They still went on working.连成一句话
• ——Look,the light in the teacher's office is still on.Miss Li is working there.——Look,the light in the teacher's office is still on.Miss Li is working there.——It________ be Miss Li.She's gone to England for a short visit.A.can't B.mustn't C.needn't D.may not