【Karen】評論
[Exercising regularl☆,☆☆☆☆☆☆☆ ...
【Zi】評論
動名詞、名詞當主詞(B.D)而(C)應改為To exercise regularly(副詞修飾動詞)
【再拼一次國營!】評論
(C) 把 regular 改成 regularly 也不對,因句意上的關係。正確應寫成:To keep healthy and fit, he exercises regularly.