Why was he fined?
He happened to ______ flowers in the park.
A.be seen step on B.be seen picking C.be caught to pull D.catch damaging
參考答案:本题考查动词辨析以及非谓语动词的语态。根据句子的意思分析，此处应该使用被动。A项的step on作be seen的宾补时，不能用原形；C项的结构应该为be caught doing sth.。
答案：B
Why was he fined?
He happened to ______ flowers in the park.
A.be seen step on B.be seen picking C.be caught to pull D.catch damaging
參考答案:本题考查动词辨析以及非谓语动词的语态。根据句子的意思分析，此处应该使用被动。A项的step on作be seen的宾补时，不能用原形；C项的结构应该为be caught doing sth.。
答案：B