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    I have already forgotten ______ you bought the computer.

    A. that it was when B. that it was what

    C. what it was that D. when it was that

    D

    【解析】

    试题分析：句意：我已经忘了你究竟是什么时候买的这台电脑的了。you bought the computer说明句子的主谓宾结构完整，所以用疑问副词when放在强调句中，在宾语从句中句子的语序是陈述语序，故选D。

    考点：考查宾语从句和强调句式的用法。

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