Question

Helen ______ her keys in the office so she had to wait until her husband ______ home.

   A. has left; comes                    B. left; had come

   C. had left; came                     D. had left; would come

 

Answer 1

【答案】

C

【解析】考察時態。根據句意可知，Helen因為先把鑰匙丟在了辦公室，所以她要等她的丈夫回家。

所以leave發生在had to wait之前，即過去的過去，用過去完成時，第二空是until引導的時間狀語從句，從句中用一般過去時表示過去將來。