Helen _______ her keys in the office so she had to wait unti

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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
要有解析,

【答案】C had left； came
【句意】海伦把她的钥匙忘在办公室了,所以她不得不等到她丈夫回家.
【解析】
①考查过去完成是的用法
句中 had to 提示是过去时,忘钥匙的动作发生在过去的过去,所以用过去完成时 had left
②考查until的用法
后面多用一般现在时,一般过去时
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