-Was his father very strict with him when he was at school?-Yes.He had never praised him ___ he became one of the top students in his grade.A.after B.before C.until D.unless

问题描述:

-Was his father very strict with him when he was at school?
-Yes.He had never praised him ___ he became one of the top students in his grade.
A.after B.before C.until D.unless

B对吗?对的话再解释。

B
翻译下就知道了 他父亲在他成为尖子生之前从来没有表扬过他。。。

B.before
他上学的时候他父亲对他很严格吗?
是的,在他成为年级优秀生之前他父亲从没表扬过他.
只有BC意思上是成立
但是not until句型主句不用完成时