. He must be curious about everything in the lab, for this/that/it is the first time that he has been there, ________?
A.isn’t he | B.mustn’t | C.isn’t it | D.hasn’t he |
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. He must be curious about everything in the lab, for this/that/it is the first time that he has been there, ________?
A.isn’t he | B.mustn’t | C.isn’t it | D.hasn’t he |
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