10.Helen ___ her key in the office so she had to wait until

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10.Helen ___ her key 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详细解析为什么选C

c,
she had to wait 这句可以看出时态是过去,until 后也用一般过去时.排除D.把钥匙落在办公室是在等她丈夫之前 ,时态应该是过去的过去,即过去完成时,所以第一空先可以排除A.B.故选C.

10.Helen ___ her key in the office so she had to wait until 一道语法题Helen _____ her key in the office so she had to wait un Helen _____ her keys in the office so she had to wait until Helen ( ) her keys in the office so she had to wait until he 英语改错并说明原因Helen left her key in the office,so she had to wait Helen had left her keys in the office so she had to wait unt Helen had lost her keys in the office so she had to wait unt 英语15.Helen _______ her keys in the office so she had to wait Helen _______ her keys in the office so she had to wait unti Helen___her keys in the office,so she had to wait until her Helen___her keys in the office so she had to wait until her Mrs Smith____her keys in the office.so she had to wait until