[单选题]
Which of the following has covalent bonding?
I.$CCl_4$
II.$C{a_3}{N_2}$
III.$N{H_3}$
A. III only
B. I and II only
C. I and III only
D. I, II and III
参考答案: C
本题详细解析: Non-metal elements bond to each other covalently.$C{a_3}{N_2}$ is made up of a metal and a nonmetal (with a large difference in electronegativity) and has ionic bonding.
