Mr. White came to our school in and since then he us English.A. teachesB. taughtC.

问题补充：

Mr. White came to our school in , and since then he us English.

A. teaches

B. taught

C. has taught

D. will teach

答案：

A. teaches

B. taught

(答案→)C. has taught

D. will teach

解析：本题考查动词时态。从since then知应该用现在完成时态。