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    精英家教网 > 高中英语 > 题目详情
    In my opinion he is a little upset _____ what I mentioned above.

    A. since
    B. because of
    C. because
    D. as
    B
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    科目：高中英语 来源：同步题 题型：单选题

    In my opinion he is a little upset _____ what I mentioned above.
    [     ]
    A. since
    B. because of
    C. because
    D. as

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