题目:
Tom described his father, who _______ a brave boy many years ago, as a strong-willed man. [ ]
A. would be
B. could be
C. must be
D. must have been
答案:
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答案:D本题考查的是质量守恒定律及其应用,常见化学反应中的质量关系。根据质量守恒定律,结合题意“反应2A + B =" 3C" + D中,已知20克A与4克B恰好完全反应,生成6克D”,则可知同时生成C的质量为20+4—6...