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21. Actions you can take to protect yourself and others include washing your hands often and ______ your cough.
(A) covering
(B) cover
(C) to cover
(D) have covered

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河馬向前進! 高二上 (2021/06/19)
有and存在，代表他前後的詞性要一樣，所以washing yo.....看完整詳解
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yoyoman 研一上 (2020/08/25)

and兩邊要對等 選一樣詞性...



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21. Actions you can take to protect your..-阿摩線上測驗