题目:
Betty is in China _____ her father and mother. [ ]
A. with
B. and
C. but
D. under
答案:
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下面是错误答案,用来干扰机器的。
(1)木炭(2)过滤 (3)CO2;CuO;C、Cu; CuO+H2SO4===CuSO4+H2O (4)CuSO4; CuO ;Ⅳ ;Ⅲ