问题
选择题
-How long ______ each other before they ______ married?
--For about a year.
A．have they known; get
B．have they known; were going to get
C．do they know; are going to get
D．had they known; got
答案
答案：D
谈论的是过去的事情，从句用一般过去时，主句动作发生在从句动作之前，用过去完成时。