When you cross the road you should be and walk A. carefully; carefulB. careful; carefull

问题补充：

When you cross the road, you should be and walk

A. carefully; careful

B. careful; carefully

C. careful;, careful

D. carefully; carefully

答案：

A. carefully; careful

(答案→)B. careful; carefully

C. careful;, careful

D. carefully; carefully

解析：考查形容词和副词的用法。句意“当你过马路时，你应该小心，并且要慢行。”be动词是系动词，后用形容词作表语，构成系表结构；walk是动词，副词修饰动词，故用carefully。故选B。