单选题＿＿＿＿＿＿＿＿＿＿ the interruption, he wasn’t able to finish his exercise before the class was over. 的答案

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题目内容：
＿＿＿＿＿＿＿＿＿＿ the interruption, he wasn’t able to finish his exercise before the class was over.
题目选项

Despite of

Because of