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27．At last, the boys found themselves in a pleasant park with trees providing shade and____down to eat their picnic lunch.

       A．to sit B．sat     C．sitting       D．having sat

At last, the boys found themselves in a pleasant park with trees providing shade and_________down to eat their picnic lunch.

       A．to sit B．sat     C．sitting       D．having sat

At last, the boys found themselves in a pleasant park with trees providing shade and     down to eat their picnic lunch．

A．to sit        B．sat           C．sitting          D．having sat

27．At last, the boys found themselves in a pleasant park with trees providing shade and____down to eat their picnic lunch.

 At last, the boys found themselves in a pleasant park with trees providing shade and     down to eat their picnic lunch.  

    A．to sit           B．sat          C．sitting        D．having sat

．At last, the boys found themselves in a pleasant park with trees providing shade and__________down to eat their picnic lunch

       A．to sit B．sat     C．sitting       D．having sat

．At last, the boys found themselves in a pleasant park with trees providing shade and__________down to eat their picnic lunch

       A．to sit B．sat     C．sitting       D．having sat

．At last, the boys found themselves in a pleasant park with trees providing shade and__________down to eat their picnic lunch