One of the reasons why men invented certain sounds to express thought and actions was that __________.（2分）<br>Athey could agree upon certain signs<br>Bthey could write them down<br>Cthey could combine them<br>Dthey could communicate with each other

One of the reasons why men invented certain sounds to express thought and actions was that __________.（2分）
Athey could agree upon certain signs
Bthey could write them down
Cthey could combine them
Dthey could communicate with each other

出自：山东第一医科大学2022年下半年英语2（本）在线考试

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