问题
选择题
Reading books is very important for developing the students' understanding of the world, ?[ ]
A. is it
B. are they
C. isn't it
D. aren't they
答案
答案：C
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Reading books is very important for developing the students' understanding of the world, ?[ ]
A. is it
B. are they
C. isn't it
D. aren't they
答案：C