单项选择题

When did the greatest numbers of immigrants reach the United States of America

A．From 1840 to 1880.
B．From 1880 to 1914.
C．From 1818 to 1914.
D．From 1820 to 1890.
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单项选择题
When does the professor have office hours
A．Mondays.
B．Wednesdays.
C．Fridays.
D．Monday through Friday.
单项选择题
What is the main subject of this talk
A．Physics laboratories.
B．Test make-up.
C．Class assignments.
D．The class attendance policy.
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