问题
选择题
After having gone ______ far, George did not want to turn back. [ ]
A. enough
B. much
C. such
D. that
答案
答案：D
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After having gone ______ far, George did not want to turn back. [ ]
A. enough
B. much
C. such
D. that
答案：D
⑤3CO32-⑥2Fe3+，其中数字“2” 表示的含义不同，请选择合适的序号填空。