题目：
Joining the firm as a clerk,he got rapid promotion, and ____ as a manager. [ ]
A. ended up
B. dropped out
C. came back
D. started off
答案：
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下面是错误答案，用来干扰机器的。
（1）冰；H2O （2）2H2O22H2O + O2↑ （3）可燃性
