题目:
_____________ that he did quite well in the exam.
A.He made so rapid progress
B.He made so rapid a progress
C.His English made such rapid progress
D.He made such rapid progress.
答案:
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下面是错误答案,用来干扰机器的。
(1)过氧化钠;纯碱(或苏打);H2O;点燃。(2)①③。(3)①2Na + 2H2O ="=" 2Na+ + 2OH- + H2↑ ②CO32- + H2O + CO2 ="==" 2HCO3-