(单选题)
He often tells lies, ______ is why they have lost trust in him.
A.that
B.this
C.which
D.it
参考答案：C
参考解析：
考查关系代词which的用法。句意：他经常说谎，这就是他们对他失去信任的原因。分析句子结构可知，______ is why they have lost trust in him为非限制性定语从句，先行词为前面这件事情，应用which引导。故选C。
知识点：
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