单项选择题

Agriculture was a step in human progress （） which subsepuently was not anything comparable until our own machine age.

A．in
B．for
C．to
D．from

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单项选择题
（） have come up with the solutions to the problem.

A．The boy student
B．The boys student
C．The boy students
D．The boys sutdents
单项选择题
I'll never forget （） you for the first time.

A．to meet
B．meeting
C．to have met
D．having to be meeting
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