问题补充：
Can you tell me ?
A. what are they doing that for
B. why they are doing for
C. why are they doing that
D. what they are doing that for
答案：
A. what are they doing that for
B. why they are doing for
C. why are they doing that
(答案→)D. what they are doing that for
解析：可联系答.案.网客服索取。
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