A.on need | B.in demand | C.by request | D.for requirement |
A.at a time | B.all the time | C.for the time being | D.at one time |
A.on | B.in | C.at | D.through |
A.from | B.at | C.off | D.in |
A.on | B.with | C.to | D.for |
A.to be great significance | B.to be of great significant |
C.of great significance | D.great significant |
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