Before the earthquake mice ran out of the fields for places to hide.A. lookB. lookingC.

问题补充：

Before the earthquake, mice ran out of the fields for places to hide.

A. look

B. looking

C. looked

D. were looking

答案：

A. look

(答案→)B. looking

C. looked

D. were looking

解析：地震之前老鼠从地里跑出，寻找藏身之地。looking for places to hide是现在分词做状语，对句子做补充说明。故B项正确。本题最容易错选的为C项。如选择C项，该句出现两个谓语动词，应在第二个动词前面加上连词and。