您好，这一句 She was fortunate in that she had friends to help her. 这里的 in that 假如用 because 替代，可能更清楚些了：She was fortunate because she had friends to help her. 表示主句和从句是（原因结果）的关系，所以 in that she had friends to help her 是一个状语从句，in that 是引导词，引导（原因状语从句）解释为什么（她是幸运的），因为他有朋友可以帮她。
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