单项选择题

A．A lecture.
B．His office.
C．A party.
D．A meeting.
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单项选择题
A) Light darkens silver salt. B ) Light darkens natural salt. C) Light darkens silver. D) Light darkens self- developing film.
A) Light darkens silver salt. B ) Light darkens natural salt. C) Light darkens silver. D) Light darkens self- developing film.
单项选择题
A) 1727. B ) 1839. C) 1823. D) 1860.
A) 1727. B ) 1839. C) 1823. D) 1860.
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