【单选题】 Today the energy problem becomes critical. It ______ an immediate solution.
A.calls on
B.calls for
C.calls up
D.calls at
网考网参考答案:B
网考网解析:
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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