MS Excel
To activate the previous cell in a pre-selected range, press

The Alt key
The Enter key
None of these
The Tab key

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MS Excel
You can select a single range of cells by

Pressing the Shift key and an arrow key
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Pressing the Ctrl key while dragging over the desired cells
Dragging over the desired cells

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