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A before LIBRARY. The lack of an article specifically indicates that the noun is indefinite. But here the noun, LIBRARY is definite, it may be one or more than one. Since, WAS is used before ONCE, it shows that single library is being talked about. Thus, A must be used.
Which of the following is NOT a spreadsheet software?
In Windows operating system it is the long horizontal bar at the bottom of a screen.
How can you hide a slide in a presentation without deleting it?
Turn on _____, which allows word to break lines between the syllables of words.
Which Excel function is used to count the number of cells in a range that meet specified criteria?
Which one performs a special operation with the combination of other?
Which file format allows you to save a PowerPoint presentation that can be played on any computer without requiring PowerPoint?
Which of the following in not an input device?
Enter key is an alternative to press ________ button?
In Microsoft Excel, which shortcut key is used to insert a page break?