The shortage of energy is getting worse. It _______an immediate solution.

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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

解析短语辨析call off“取消”；call up“召集，打电话．使人想起”；call for“要求，需求，叫某人来”；无call at这种搭配。

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