单项选择题

A．1998-2000.
B．1989-1992.
C．1998-2001.
D．1999-2002.
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单项选择题
Which of the following is the main topic of the passage
A．Agriculture advances were needed to help feed a growing population.
B．Safer machines were demanded by the labor movement.
C．Machines contributed to the agricultural revolution.
D．Indiana took the lead in the agricultural revolution.
填空题
Since I (finish) ______ reading the book, I can return it to the library.
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