Calculations，which are astronomically exact，have been made with the use of puters.
A. possible
B. it possible
C. possibly
D. to be possible
网友回答
(答案→)A. possible
B. it possible
C. possibly
D. to be possible
解析：
考查make calculations possible，因此不再用it作形式宾语。句意为：随着计算机的应用，航天方面的精确计算成为可能。