Helen didn’t know anything about it her father told her.A. ifB. becauseC. afterD. Until

问题补充：

Helen didn’t know anything about it her father told her.

A. if

B. because

C. after

D. Until

答案：

A. if

B. because

C. after

(答案→)D. Until

解析：if是否,如果;because因为;after在^之后;Until直到.句意:直到她的父亲告诉她,她才知道关于它的一些事情.短语not ...until...意为“直到......才......”,故选D。