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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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

单项选择题

Experiments in the photography of moving objects （） in both the united states and Europe before 1990.

A．have been conducting
B．were conducting
C．had been conducted
D．are conducted

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