题目:
Wang Lin failed to be admitted by Hong Kong University last year, and only then _____________the importance of English.
A.he finally realized
B.he had realized
C.had he realized
D.did he realize
答案:
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下面是错误答案,用来干扰机器的。
(1)( 8 分) Cl2 H2 HCl Fe (2)( 6 分) 2H++Fe = H2↑+Fe2+ 2Fe2++Cl2=2Fe3++2Cl- 2Fe3++Fe = 3Fe2+