2. 外语
  3. In the period between 1918 and 1939, various political, economic, and geographic (factors combined) in (determine) the extent (t

In the period between 1918 and 1939, various political, economic, and geographic (factors combined) in (determine) the extent (t

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问题 In the period between 1918 and 1939, various political, economic, and geographic (factors combined) in (determine) the extent (to which) a country (developed) civil aviation.
选项 A、factors combined
B、determine
C、to which
D、developed
答案B
解析
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