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 Hekeptyawninginclassthismorning.Thatis

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 Hekeptyawninginclassthismorning.Thatis

 He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

       A. why              B. how             C. because             D. whether [

【回答】

C

知识点:连词

题型:选择题

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