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(shí)態(tài)。根據(jù)句意可知，Helen因?yàn)橄劝谚�匙丟在了辦公室，所以她要等她的丈夫回家。

所以leave發(fā)生在had to wait之前，即過(guò)去的過(guò)去，用過(guò)去完成時(shí)，第二空是until引導(dǎo)的時(shí)間狀語(yǔ)從句，從句中用一般過(guò)去時(shí)表示過(guò)去將來(lái)。