四六级考试

【单选题】 I would have told him the answer had it been possible, but I ______so busy then.
A．am
B．were
C．was
D．would be

网考网参考答案：C
网考网解析：
本句的前半句是虚拟语气，但but后表示真实条件，应该用一般过去时。 查看试题解析出处>>