The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.

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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。initiate意为“开始、发起”;originate意为“起源、发生”;embark意为“着手、从事”;commence意为“开始、着手”。只有commence符合句意。
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