问题
选择题
Only by________your attention________what you are learning can you learn it well. [ ]
A. focus; on
B. pay; on
C. focusing; on
D. paying; on
答案
答案：C
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Only by________your attention________what you are learning can you learn it well. [ ]
A. focus; on
B. pay; on
C. focusing; on
D. paying; on
答案：C