答案：D
题干意思你的投诉正在调查中，一旦有结果，我们会再写信给你的。
解析：
A. look through to read something quickly 浏览，快速看
She looked through her notes before the exam.她考试前匆匆看了一下笔记。
B. look over a swift cursory examination or
inspection检查
We looked over the house again before we decided we would rentit那房子我们又看了一次才决定租下来的。
C. looked after keep under careful scrutiny 照顾
She looked after her ailingfather.她照顾有病的父亲。
D. look into to examine the facts about a
problem or situation 调查，研究
A working party has been set up to look into the problem.已成立一个工作小组来调查这个问题。
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