问题补充:
To their great fear, they found in the heaviest snowfall they had ever had.
A. they were catching
B. themselves caught
C. they had caught
D. themselves catching
答案:
A. they were catching
(答案→)B. themselves caught
C. they had caught
D. themselves catching
解析:本题考查非谓语动词的用法。根据句型结构以及句子对语态的要求,此处用过去分词短语作宾语补足语,构成find oneself done,表示“发现自己被……”;另外be caught in也是固定用法,表示“遭遇”。