成人英语三级考试

【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”。 查看试题解析出处>>