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Using a relative clause:
We talked about the project last time. The project is now nearing completion.
【正确答案】：The project (which/that) we talked about last time is now nearing completion.
【题目解析】：如果关系代词是介词补语，介词如果没有提前到关系代词的前，则可用which或that，或者直接省略关系代词。