GWD-1-Q30:

The ancient Anasazi harvested such native desert vegetation as the purple-flowered bee plant, what they now commonly call wild spinach in northern Arizona and other parts of the southwestern United States.

1. what they now commonly call

2. a plant that they now commonly call

3. now commonly called

4. and is mow commonly called

5. which it is now commonly called
                       

请问各位NN，这里的C没用连词怎么能连接两个句子呢？

定语从句省略which is

which is now commonly called...