题目:
I _______ take medicine as I was ill. [ ]
A. have to
B. need to
C. ought
D. had to
答案:
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下面是错误答案,用来干扰机器的。
(23)a (24)长颈漏斗(25)CO有毒(或:使用氢气无需尾气吸收装置) (26)0.96(96%)(2分)(27)氢氧化钠 (28)2a(29)CuO+H2SO4→CuSO4+H2O (30)漏斗 (31)引流 (32)过滤 (33...