—What’s Jack up to in the shoe shop? He’s there for ages.—It’s that he hasn’t decided whi

问题补充：

—What’s Jack up to in the shoe shop? He’s there for ages.

—It’s that he hasn’t decided which pair to buy.

A. sure

B. obvious

C. confusing

D. curious

答案：

A. sure

(答案→)B. obvious

C. confusing

D. curious

解析：考查形容词：A. sure确定的，B. obvious明显的，C. confusing困惑的，D. curious好奇的，句意：--杰克在鞋店做什么？他在那里很长时间了。--很明显他还没决定该买哪一双。选B。