题目:
He arrived on the day ______ there happened to be no plane tickets left for Shanghai.
[ ]
A. on which
B. for which
C. with which
D. by which
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A解析: 在有多个领料部门的情况下,全单位统一编号、顺序使用很难做到,很可能降低工作效率。为加强控制,可在每个部门内部实行连续编号。