We were supposed to have a chemistry class, but Mr. Anderson was out of town for a meeting, so we had a history lesson instead.
我们本来要上化学课，不过安德森老师出城去开会，所以我们改上历史课。
They know I will always come to class because I have promised myself that I will not miss a lesson during college.
他们知道我会来上课，因为我答应过我自己，在大学期间不错过一节课。
They did have suggestions — individual conferencing is inefficient, make full use of teaching time in class, write difficult parts of the lesson in red on the board — which I followed.
他们确实提了建议——单独讨论效率太低，充分利用课堂教课时间，在黑板上用红笔标注课堂难点，我采纳了这些建议。
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