问题
选择题
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
C
题目分析: 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。