43．--Look, the light in the teacher' s office is still on．Mr. Li is working them．He always works la——青夏教育精英家教网—

摘要：43．--Look, the light in the teacher' s office is still on．Mr. Li is working them．He always works late at night． --It be Mr. Li．He’s gone to London for a visit． A．can’t B．mustn’t C．may D．needn’t

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－Look, the light in the teacher’s office is still on．Mr Li is working there．He always works late at night．

－It ________ be Mr Li．He has gone to London for a short visit．

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A．can’t

B．mustn’t

C．may

D．must

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--- Look, the light in the teacher's office is still on. Mr Li is working there. He always works late at night.

--- It ________ be Mr Li. He has gone to London for a short visit.

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