单项选择题

We can't afford to let the situation get worse. We have to take （） to put it right.

A．decisions
B．advantages
C．sides
D．steps

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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
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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