Question

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

Answer 1

C

考查時態。had to提示是一般過去時，發生在“過去的過去”的事情，用過去完成時，排除A、B；until引導的時間狀語從句的時態要與主句一致，故用過去時，排除D。故選C。