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; cameD．had left; would come
C
考察時態(tài)。根據(jù)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(fā)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(dǎo)的時間狀語從句，從句中用一般過去時表示過去將來。
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