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:考查find后跟宾补的结构。A、C是宾语从句,they和catch是动宾关系,应该用被动,排除A、C;find sb+doing/ done/adj作宾补,发现某人......。they和catch是动宾关系,排除D。故选B。