Aiming to get an accurate count of the population, the sixth census (第六次人口普查) started on Nov. 1st,
_____ millions of Chinese census takes will have a lot of work to do in this month.

A. from which on
B. on which day
C. at which time
D. during which time
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科目：高中英語 來源：0118 期中題 題型：單選題

Aiming to get an accurate count of the population, the sixth census (第六次人口普查) started on Nov. 1st,
_____ millions of Chinese census takes will have a lot of work to do in this month.
[     ]
A. from which on
B. on which day
C. at which time
D. during which time

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