_____ the girl was too selfish and never thought of others, she wasn’t getting on well with her classmates.

A．Though

B．Unless

C．Since

D．Until

脚手架拆除前，现场先拉好警戒围栏，现场技术人员和专职安全管理人员应对拆除作业进行巡查，及时纠正违章行为。