2. 专升本
  3. Today the energy problem becomes critical. It ______ an immediate solution.

Today the energy problem becomes critical. It ______ an immediate solution.

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问题 Today the energy problem becomes critical. It ______ an immediate solution.
选项 A、calls on
B、calls for
C、calls up
D、calls at
答案B
解析 动词与介词搭配。call on，号召、呼吁；call for，要求、需要；call up，征召、召唤；call at，没有该词组。It calls for an immediate solution。能源问题急需解决。
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