2、—Where are the boys?

—Oh，they         basketball on the playground just now．

A．were seen play              B．were seen to play

C．have seen to play            D．have seen play

2、B

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—Where are the boys?

—Oh，they         basketball on the playground just now．

A．were seen play              B．were seen to play

C．have seen to play            D．have seen play

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