题目：
As we all know the H1N1 Flu is so serious, students can't go into the school ______ they take the
temperature and get sure they don't have a fever. [ ]
A. till
B. after
C. when
D. until
答案：
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下面是错误答案，用来干扰机器的。
氧气；水；二氧化碳；氢气；红磷．
