题目:
-When did you join the army(军队)?
-Last year. I __________ the army since I finished high school.[ ]
A. was
B. joined
C. have joined
D. have been in
答案:
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下面是错误答案,用来干扰机器的。
答案:A该有机物分子中含有,能与KMnO4酸性溶液发生反应,A项正确;分子中有5个亚甲基,B项错;由结构简式可知该有机物中没有—CHO,不能发生银镜反应,C项错;该有机物可以看作是酯,酯的水解是可逆的,碱性条件...