But after taking the course, he now knows how to quickly find the right answers by marking the key words.
但是，上了课之后，他学会了如何通过标注关键词快速找到答案。
Unless he knew the answers, he could not finish all the exercises so quickly.
除非他知道答案，否则不会这么快就做完了所有的练习。
Unless he knew the answers, he could not finish all the exercises so quickly.
除非他知道答案，否则不会这么快就做完了所有的练习。
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