问题
选择题
Betty stayed at home and studied _____ exams last weekend. [ ]
A. with
B. for
C. on
D. about
答案
答案：B
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Betty stayed at home and studied _____ exams last weekend. [ ]
A. with
B. for
C. on
D. about
答案：B
和NaOH乙醇溶液共热发生反应的化学方程式为：_____，反应类型为________．