课上要认真听讲。
在我的课上，她总是认真听讲，仔细观察。但这次的情况却完全不同。
She always watched and listened very carefully to my teaching, but this was different.
在博尔英语课上，我很积极举手发言，上课认真听讲。
At the English class in Power, I'm active to speak and study hard.
在课上大家都认真听讲的时候，他偏偏听起了随身听。
In class when everybody was listening carefully, he must turn his walkman on.
在课上大家都认真听讲的时候，他偏偏听起了随身听。
In class when everybody was listening carefully, he must turn his walkman on.
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