.Hearing that a 7.1-magnitude earthquake hit the Yushu county Qinghai province on April 1

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

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