英语15.Helen _______ her keys in the office so she had to wait until her husband ________ home.

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15.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
为什么

c

应该选四号(D)理由是:海伦她的钥匙放在办公室里是已经发生过的事,所以要用过去式.这样,(A)和(B)就被排除了,还有(C)和(D)两个选项,她只有等她的丈夫回来,说明还没有回来,所以应用将来时,所以这道题应选四号(D)

C
前半句的动作发生在后半句之前

15.Helen _______ her keys in the office so she had to wait until her husband ________ home.
c.had left;came

两件先后发生的过去的事，先发生的事通常用 had 来表达先后

C.
Helen _______ her keys in the office so she had to wait until her husband ________ home.
注意so后面的句子 had to. had是过去式， 忘记拿钥匙的动作发生在过去的过去，所以要用过去完成时。
后面就等他老公回来，可以用一般过去式表示过去将来的动作。

c

句意：HELEN将她的钥匙留在了办公室里，所以她必须等他丈夫回家。

Helen遗忘了她的钥匙是过去已经完成的状态，所以用HAD LEFT；“UTILL HER HUSBAND COMA ”HOMEUtill所引导的是一个从句，而从句的时态一般应为一般过去时态