单项选择题

（）, the researchers cannot concentrate on that very precise experiment.

A．With you standing there
B．On your standing there
C．You are standing there
D．You stand there

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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
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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