Can Sheng in D key be used to play opera?

Can.

The D-key Sheng has four keys, namely D, G, C, and A, and can be used to play opera.

In the traditional Sheng, you press the hole with your fingers to control which tube produces sound.

The improved sheng adds buttons, and one finger can control multiple buttons to control more sounds.

Modern Chinese orchestras often use thirty-six-reed sheng instead of traditional sheng.