题目

—Why was he fined? —He happened to ________ several flowers in the park. A. be seen to pick           B. be seen picking C. be caught to pick         D. catch picking   答案： A 句意为：——他为什么被罚款？——他碰巧被看见在花园里摘花。happen to do sth. 碰巧做某事；sb. be seen to do sth. 某人被看到做某事，表示动作的全过程。故A项符合题意。  

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