—When did you come back last night?—It was not until 11 o'clock the party ended. A. thatB

问题补充：

—When did you come back last night?

—It was not until 11 oclock the party ended.

A. that

B. when

C. where

D. how

答案：

A. that

B. when

C. where

D. how

解析：答案：B考查特殊句式。when引导定语从句，省略了强调句的后面成分，完整的句子为：It was not until 11 oclock when the party ended that I came back.