Only by ____your attention on what you're learning can you learn it well.A focusing B paying 选A
为什么
人气：401 ℃ 时间：2020-03-30 21:42:09
解答
A.
这里面是两个固定短语,
pay attention to
focus attention on
再加上by是一个介词,后面要加动词的ing形式.
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