—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
—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
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。