CouldyoutellmewhyIamconstantly

更新 2022-09-03
科目英语
题型单选题
难度较难
浏览 369

--- Could you tell me why I am constantly yawning this afternoon?
---Yawning ______ an indication that your body lacks oxygen and needs a rest.

A．acts as

B．serves as

C．functions as

D．plays as

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