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

______ a contract last year and it is still valid.

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问题 ______ a contract last year and it is still valid.
选项 A、We have signed
B、We signed
C、We haven’t signed
D、We have signed
答案B
解析 当需要强调时间时，用一般过去时，所以选项B是正确的。
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