Question

【題目】David and Tom are good friends. They ______ each other for ten years.

A. knew B. know C. have known D. had known

Answer 1

【答案】C

【解析】

試題分析：句意：大衛(wèi)和湯姆是好朋友。他們已經(jīng)認(rèn)識(shí)10年了。結(jié)合句意可知，是說明他們現(xiàn)在的情況，也就是到現(xiàn)在為止，他們已經(jīng)認(rèn)識(shí)10年了，故時(shí)態(tài)運(yùn)用現(xiàn)在完成時(shí)態(tài)，答案為C。