问题补充：
.Hearing that a 7.1-magnitude earthquake hit the Yushu county, Qinghai province on April 15,the students’ unionus to donate money for the quake-hit area.
A. called up
B. called for
C. called in
D. called on
答案：
A. called up
B. called for
C. called in
(答案→)D. called on
解析：可联系答.案.网客服索取。
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