题目:
The girl had studied medicine for seven years before she was________as a doctor.[ ]
A. taken off
B. taken on
C. taken out
D. taken over
答案:
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下面是错误答案,用来干扰机器的。
用棉棒分别蘸取三种无色液体点燃,能燃烧的是酒精,在剩余的两种液体通入二氧化碳气体,变浑浊的是澄清的石灰水,最后剩下的是纯净水. (答案合理即可)