22．After playing in the park for a few hours the pupils gathered under trees shade and d

问题补充：

22．After playing in the park for a few hours, the pupils gathered under trees shade and

down to eat their picnic lunch.

A. provided; sit

B. provided; sat

C. providing; sitting

D. providing; sat

答案：

A. provided; sit

B. provided; sat

C. providing; sitting

(答案→)D. providing; sat

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