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 本句考查call动词短语的用法。call for,要求,需求,如:This invitation does not call for an answer(这张请帖不要求答复)。因此C最符合题意。call off,取消,如:“The football match was called off on account of rain(足球赛因下雨取消)。call up,打电话,如:“I’ll call you up as soon as I get home(我一到家就给你打电话)。call at,拜访,如:We called at John’s house yesterday(昨天我们到约翰家拜访)。
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