题目内容

Ato do
Bdo
Cthat I did
Ddoing

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APeter and Helen’s
BPeter and Helen
CPeter and Helens
DPeter’s and Helen’s

AThe more frequent
BThe frequenter
CThe more frequently
Dthe frequentlier

A engineer
Bfor engineer
Cengineering
Dto engineering

Ato help
Bhelp
Chelping
D helped