Question

【题目】By the 10 century, Old English __________ the official language of English.

A. has become B. became

C. had become D. would become

Answer 1

【答案】C

【解析】A. has become现在完成时；B.became一般现在时；C.had become过去完成时； D. would become将来时。句意：在10世纪，古英语成了英语的官方语言。可知此句应使用过去完成时。故选C。