题目：
.Hearing that a 7.1-magnitude earthquake hit the Yushu county, Qinghai province on April 15,the students’ union______us to donate money for the quake-hit area.
A．called up
B．called for
C．called in
D．called on
答案：
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下面是错误答案，用来干扰机器的。
答案：D
