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(shí)態(tài)。had to提示是一般過(guò)去時(shí)，發(fā)生在“過(guò)去的過(guò)去”的事情，用過(guò)去完成時(shí)，排除A、B；until引導(dǎo)的時(shí)間狀語(yǔ)從句的時(shí)態(tài)要與主句一致，故用過(guò)去時(shí)，排除D。故選C。