Yep, D7 is fully completed right now, and why it cannot be deployed within this year?
According to my statistics model, CX#07 (what you called D7) should be commissionned around Septembre 2017.
The raison behind is simple : Completed doesn't mean tested, tested doesn't mean trained, trained doesn't mean they are ready to accept the boat.
Take an example of Type 052C - 10 months after being launched the propulsion, navigation and communication tests begin and these will last for 8 months.
Once finished those stuff finished they start the first phase of combat systems tests (especially ASW capacities) for 5 months, followed by 6 months of main weapon systems tests.
And from official delivery to commissioning ceremony, you need to count 1 month more.
That's the reason why the boat "seems to be" ready for you but is is "still" not deployed. Too quick is not "科学", as what you guys say, right ?
The next one to be commissionned should be 117 Xining by Novembre this year.
Henri K.