题目内容

A looking after
Bto look after
Clook after
Dlooking for

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Aunfortunate
Bpity
Cregretable
Dunlucky

Atalked
Btalking
Cto talk
Dhave talked

Acoughing
Bto cough
Cthat he coughed
Dcough

Aon listen
Bto listening
Clistening
Dlistened

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