问题补充：
What can you suppose they this time next year?
A. are doing
B. will do
C. will have been done
D. will be doing
答案：
A. are doing
B. will do
C. will have been done
(答案→)D. will be doing
解析：考查时态。句意：你认为他们明年这个时候正在干什么？根据语境将来某一时刻进行的动作应用将来进行时态。所以选D。
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