问题
选择题
_____ is very useful for us students _____ English well. [ ]
A. This, to learn
B. That, to learn
C. It, to learn
D. It, learns
答案
答案：C
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_____ is very useful for us students _____ English well. [ ]
A. This, to learn
B. That, to learn
C. It, to learn
D. It, learns
答案：C