The shortage of energy is getting worse. It______ an immediate solution.A、calls

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问题 The shortage of energy is getting worse. It______ an immediate solution.

选项 A、calls off
B、calls up
C、calls for
D、calls at

答案 C

解析 call for：要求，需求；call off：取消；call up：打电话；call at：拜访。因此C最符合题意。

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[originaltext]ChinesestudentsintheUnitedStatesaregettinganearlier