The Space Age______in October 1957 when the first artificial satellite was launc

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问题 The Space Age______in October 1957 when the first artificial satellite was launched by the Soviet Union.

选项 A、initiated
B、originated
C、embarked
D、commenced

答案 D

解析动词词义辨析。根据句子结构，应填入不及物动词，排除A和C项。根据句中in October1957提供的信息，此处是指“太空时代开始于……”。originated意为“发源，来自，产生”，不及物动词，后一般不接时间。commenced“开始，使开始，着手”，不及物动词，可接时间。故答案为D。

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