请选择DCBA7v6k,W6^7q9~1q4D3B Mr. Wang and his students ________ a lesson now．8N)G8R-k5[
A．are having8N)G8R-k5[
B．had8N)G8R-k5[
C．have8N)G8R-k5[
D．are have8N)G8R-k5[