Be quick Tom!I needpen to mark the page.Can you getfor me?A. one;itB. a;thatC. the;oneD. a

问题补充：

Be quick,Tom!I needpen to mark the page.Can you get

for me?

A. one;it

B. a;that

C. the;one

D. a;one

答案：

A. one;it

B. a;that

C. the;one

(答案→)D. a;one

解析：句意为：快点，汤姆!我需要一支笔来标一下页码，你能给我拿一支吗？one代替前面所提到的一支笔。