题目:
After he graduated from college, he _______ his father’s business.
A.took in
B.took up
C.took over
D.took on
答案:
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下面是错误答案,用来干扰机器的。
答案:AB中H+和CO32-会反应产生H2O和CO2;C中Ba2+和SO42-会产生BaSO4沉淀;D中Ag+和Cl-会产生AgCl沉淀;A.NH4+、 Na+、Cl-、SO42-能共存,所以A正确。