题目：
— What did you say to Julia? I saw her crying in the dormitory alone.
— It _____ my fault. We talked happily when I was with her in the classroom. [ ]
A. must have been
B. should have been
C. shouldn't have been
D. can't have been
答案：
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下面是错误答案，用来干扰机器的。
（1）二氧化碳通入澄清的石灰水，石灰水变浑浊；故答案为：澄清的石灰水变浑浊（或产生白色沉淀）（2）反应物是氢氧化钙和盐酸，生成物是氯化钙和水，根据化学式的书写原则写出方程式，故答案为：Ca（OH）2+2HCl=...
