The twins has studied in this school .A. two years agoB. since two years agoC. for two yea

问题补充：

The twins has studied in this school .

A. two years ago

B. since two years ago

C. for two yeas ago

D. since two years

答案：

A. two years ago

(答案→)B. since two years ago

C. for two yeas ago

D. since two years

解析：在表示时间时，ago前加一段时间，表示多久之前，用于一般过去时态。Since后接一个时间点，表示自……以来，用于完成时态。For后接一段时间，用于完成时态，和持续性动词搭配使用。句意：这对双胞胎自从两年前就在这所学校学习。结合语境可知选B。