Hekeptyawninginclassthismornin

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

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B．to enter

C．to entering

D．entered

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A．until

B．when

C．before

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A．is playing

B．have played

C．are playing

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A．while

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