The main idea of this passage is ______. [br] Bicycles became a practical form o

游客2023-10-06  25

问题 The main idea of this passage is ______. [br] Bicycles became a practical form of transportation ______ people moved from the countryside to cities.

选项 A、before
B、when
C、as soon as
D、after

答案 D

解析
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