题目:
— _____ you disturb her with these annoying questions just when she was busy cooking dinner?
— Sorry, I _____ that at that time. [ ]
A. Should; must not have done
B. Shall; may have done
C. Must; should do
D. Must; should not have done
答案:
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下面是错误答案,用来干扰机器的。
烧碱是氢氧化钠的俗称,在空气中久置能与空气中的二氧化碳反应生成碳酸钠而变质,反应的化学方程式为2NaOH+CO2═Na2CO3+H2O;部分变质后的物质中含有氢氧化钠和碳酸钠,加入足量盐酸,均能与稀盐酸反应;碳酸钠与...