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  3. ______ a binding contract last year and it is still valid.

______ a binding contract last year and it is still valid.

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问题 ______ a binding contract last year and it is still valid.
选项 A、We have signed
B、We haven’t signed
C、We signed
D、We had signed
答案C
解析 遇到Last year，该动作用一般过去时。选项C是正确的。
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