Helen her keys in the office so she had to wait until her husband home.A. has left; comesB

问题补充：

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

答案：

A. has left; comes

B. left, had come

(答案→)C. had left; came

D. had left; would come

解析：考查时态。had to提示是一般过去时，发生在“过去的过去”的事情，用过去完成时，排除A、B；until引导的时间状语从句的时态要与主句一致，故用过去时，排除D。故选C。