单项选择题

Operation research is a scientific method of providing executive department with a quantitative basis for decisions ______ the operations under their control.

A. regarding
B. as to
C. on
D. considering
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单项选择题
Electronic computers, ______ the complicated mathematical operations, such as weather forecast and the control of satellites, can be done quickly and accurately.
A. being used
B. used
C. having been used
D. to be used
单项选择题
The large size and roughly circular shape of the Pacific made some scientists think that it ______ a hole left when the moon separated from the earth.
A. used to be
B. would have been
C. might have been
D. should have been
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