请教:2009年6月大学英语三级考试A级真题第2大题第1小题如何解答?【题目描述】Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections.Section ADirections: In this section, there are 10 incomplete sentences. You are required to com

【题目描述】

Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections.

Section A

Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A), B), C) and D). Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.

16. By the end of this year Mr. Smith ________in our company for exactly three years.

A) is working

B) has worked

C) will work

D) will have worked