Oh it's you! I didn’t know you here!A. amB. wereC. have beenD. will be

问题补充：

Oh, its you! I didn’t know you here!

A. am

B. were

C. have been

D. will be

答案：

A. am

(答案→)B. were

C. have been

D. will be

解析：宾语从句的时态应与主句时态相呼应，故选B