---I hear Liza and her husband have flown to Hawaii for their honeymoon．
---Oh, how nice! Do you know when they ?
A. were leaving
B. had left
C. have left
D. left
网友回答
A. were leaving
B. had left
C. have left
(答案→)D. left
解析：考查时态。本题用一般过去时陈述的过去的事实。句意：——我听说丽莎和她的丈夫飞往夏威夷度蜜月。——哦，真好！你知道他们什么时候离开的。故D正确。