---Where is Miss Wang? -She went to Hainan Island last week and will return six days.

问题补充：

---Where is Miss Wang?

---She went to Hainan Island last week and will return six days.

A. ago

B. later

C. behind

D. in

答案：

A. ago

B. later

C. behind

(答案→)D. in

解析：ago 以前的；later 更吃的，后来；behind在后面；in 在里面，在……之内；句意：王老师去哪儿了？——她上周去了海南岛，六天后回来。在将来时态中，in加一段时间表示在这段时间之后。故选D。