Calculations，which are astronomically exact，have been made ________ with the use of computers.
A．possibleB．it possible
C．possiblyD．to be possible
A

考查make calculations possible，因此不再用it作形式賓語。句意為：隨著計(jì)算機(jī)的應(yīng)用，航天方面的精確計(jì)算成為可能。
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