I saw a lot of people _________a walk in the park after supperA.to hadB.to havingC.are havingD.having

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I saw a lot of people _________a walk in the park after supper
A.to had
B.to having
C.are having
D.having

see sb doing sth:看见某人正在做某事.
所以是:having
having a walk:散步