David was responsible and hardworking, he was promoted from a clerk to a manager.A. which

发布时间：2020-08-16 11:18:37


David was responsible and hardworking,      he was promoted from a clerk to a manager.
A. which
B. as
C. for what
D. for which

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A. which
B. as
C. for what
(答案→)D. for which
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