I ain't no expert, but it looks like an inversion with the 5th missing. The 8Notes chord chart gives... C - 7th A - 5th F# - 3rd D - root The chord your teacher has given you starts on the 7th rather than the root, then does the root and 3rd, but stops before the 5th. I have no idea if it's okay to drop the 5th to play the chord 'properly'. Assuming it is, the 5th has presumably been dropped to make fingering easier, or maybe to get a specific feel from the chord that differs from versions of it that do include the 5th.
8th June, 2017