Edge Selection Tool
Use the edge selection tool when selecting edges for the hole filling tool to minimise the number of edges that need to be selected manually.
On the Tools tab, in the
Selection group, click the 
Selection Tools icon. From the drop-down list select the 
Select Edge Tool icon.
When this tool is activated, the smallest loop containing the already selected laminar and / or
free edges (wires) edges is selected. A laminar edge is an edge that is associated with a single
face.
Note: An edge is laminar when the edge is only on the boundary of a single
face.
Tip: Press Q+C to select the smallest
loop containing the edges.
Figure 1. Example 1 showing two selected wires. Using the Select edge loop tool results in the smallest loop containing these edges being selected. Note that the background colour was changed to show the selection (indicated in yellow) more clearly.
Figure 2. Example 2 showing two selected wires. Using the Select edge loop tool results in the smallest loop containing these edges being selected.