问题补充：
Do you know
A. what is this used for
B. what this is used for
C. which this is used
D. that this is used for
答案：
A. what is this used for
(答案→)B. what this is used for
C. which this is used
D. that this is used for
解析：可联系答.案.网客服索取。
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