It is said that Mo Yan's hometown is the place ____ has inspired him throughout his writing career．

A．in which

B．where

C．that

D．what

将15.55g氯化钙和碳酸钙的混合物加入26.85g水中，然后向其中加入若干克10%的稀盐酸，恰好完全反应，生成了4.4g二氧化碳气体．求：

（1）原混合物中碳酸钙的质量．

（2）加入稀盐酸的质量．

（3）反应后所得溶液中溶质的质量分数．