Hebecameanactorataveryyoungagebutitwasnearly20years

問題詳情：

 He became an actor at a very young age but it was nearly 20 years ______ he became famous.

    A. until                       B. when                     C. before                   D. that

【回答】

 C     句型：It’s /will be +時間段 before +從句：過了多久才……

知識點：連詞

題型：選擇題