he is, he seldom shows his precious coins to others.
A. Coin-collector as
B. As a coin-collector
C. A coin-collector as
D. Coin-collector that
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(答案→)A. Coin-collector as
B. As a coin-collector
C. A coin-collector as
D. Coin-collector that
解析： coin-collector硬币收集者。以as引导的让步状语从句应用倒装句，名词放于句首时，前不加冠词a。