【单选题】The committee ______ the problem for a whole afternoon but they have not yet reached an agreement.
A．has discussed
B．has been discussing
C．are discussing
D．have been discussing
网考网参考答案：D
网考网解析：
committee是集合名词，后面的谓语用复数．现在完成进行时照应后文“they have not yet reached an agreement”。
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