The young man acted strangely during the interview. He made a bad impression the employer.

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A. to
B. in
C. with
(答案→)D. on
解析：考察固定搭配。固定搭配make an impression on sb给某人留下…的印象。句意：在面试里那个年轻人的行为很奇怪，给雇主留下了很不好的印象。根据句意说明D正确。