Helen___her keys in the office,so she had to wait until her husband___home.a.has left,come

题目

Helen___her keys in the office,so she had to wait until her husband___home.a.has left,come
b.left,had come c.had left,come d.had left,would come
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答案

选C 意思是:Helen把钥匙忘在办公室了,所以她不得不等到她的丈夫回家（才能进屋）“,”引导两个并列句型,so解释了前一句的意思 她不得不等到丈夫回家,所以她忘了钥匙.而so 引导的句子的谓语是had,一般过去时.所以“,...