The Space Age ______ in October 1957 when the first artificial satellite was lau

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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

解析动词辨析。空格中要求填入一个不及物动词，故initiate不对；originate意为“来自”，后面一般跟介词from；embark意为“着手，从事”，与句意不符；commence意为“开始”，用在此处最合适。

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