All I can think of is with a helper column.
A1 = 9, A2 = 9, A3 = 10, A4 = 10
B1 =INDIRECT("data!D"&A1)
Drag B1 down to B4, then select A1:B4 and drag down.
Might be easier with VBA
Code:
Sub twoatatime()
Dim ws As Worksheet
Dim ws2 As Worksheet
Dim LastRow As Long
Dim rownum As Long
Dim rownum2 As Long
Set ws = ActiveSheet
Set ws2 = Sheets("Data")
LastRow = ws2.Cells(ws2.Rows.Count, "D").End(xlUp).Row
rownum2 = 1
rownum = 9
Do Until rownum = LastRow + 1
ws.Cells(rownum2, 1).Value = ws2.Cells(rownum, 4).Value
ws.Cells(rownum2 + 1, 1).Value = ws2.Cells(rownum, 4).Value
rownum = rownum + 1
rownum2 = rownum2 + 2
Loop
End Sub