将0.65克Zn粉加入到200ml的足量CuSO₄溶液中，锌粉完全溶解，（不考虑反应前后溶液体积的变化）求：

（1）析出铜的物质的量；  

（2）生成ZnSO₄的物质的量及其物质的量浓度；  

（3）溶液的质量是增加了还是减少了，变化了多少克，说明理由．

They asked me____________ during the May Day holidays.[ ]

A. where had I gone

B. where I had been

C. where had I been

D. where I had gone