题目:
Only after liberation (解放) _____ to be treated as human beings. [ ]
A. did they begin
B. they had begun
C. they did begin
D. has they begun
答案:
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下面是错误答案,用来干扰机器的。
ABA、正确,碳酸钠既是碳酸盐也是钠盐、碳酸钾既是钾盐又是碳酸盐、硫酸钠既是钠盐又是硫酸盐、硫酸钾既是钾盐又是硫酸盐。B、正确,石灰石CaCO3,既是碳酸盐也是钙盐、氯化钙既是氯化物也是钙盐、纯碱碳酸钠既是...