题目内容

Acoughing
Bto cough
Cthat he coughed
Dcough

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Aon listen
Bto listening
Clistening
Dlistened

Ahave
Bhas
Chad
Dhas been

Ais
Bare
Cwere
Dwas

Agrave
Bsignificant
Cgrand
Dvital

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