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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