单项选择题

It's impossible for a child to do so much work within a short period of time, ______

A. isn't it



B. is it
C. has it



D. hasn't it
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单项选择题
After a long discussion, they ______ an agreement.
A. came into


B. came out
C. came to



D. came across
单项选择题
学生活动与交往的基本场所是( )。
A．班集体
B．学习小组
C．班委会
D．少先队
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