专升本考试

【单选题】 ______ a binding contract last year and it is still valid.
A．We have signed
B．We haven't signed
C．We signed
D．We had signed

网考网参考答案：C
网考网解析：
遇到Last year，该动作用一般过去时。选项C是正确的。 查看试题解析出处>>