They thought important to look right and left when the road.A. it’s; crossB. it; to cros

问题补充：

They thought important to look right and left when the road.

A. it’s; cross

B. it; to cross

C. it; crossing

D. it was; to cross

答案：

A. it’s; cross

B. it; to cross

(答案→)C. it; crossing

D. it was; to cross

解析：

试题分析: 句意：他们认为过马路时向左右看非常重要。cross 横穿；they主语，thought谓语，it形式宾语，真正的宾语为to look right and left;when crossing the road当过马路时，疑问词+现在分词做伴随状语；故选C。