问题补充：
It has been confirmedhe wasn’t the person who stole your bike.
A. if
B. whether
C. why
D. that
答案：
A. if
B. whether
C. why
(答案→)D. that
解析：考查宾语从句。已经被证实，他不是偷你自行车的那个人。从句中不缺少句子成分，故选D，只起连词作用。
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