问题补充：
---Where are the Greens, may I ask?
---Well, they to England. They will come back in a week.
A. have been
B. are going to
C. have gone
D. will go
答案：
A. have been
B. are going to
(答案→)C. have gone
D. will go
解析：根据问句的内容Where are the Greens, may I ask，可知答案为说明，他们已经不在此处，符合题意，have gone to sp，表示说话人已经去了某地，或正在去某地的路上，故选答案为C
