The teacher,        it clear that he was disappointed with us, left the classroom.

A．made

B．having made

C．who has made

D．making

下列有关人口问题的叙述中，正确的是(　　)

A．一个国家人口增长越快越好

B．一个国家人口增长越慢越好

C．人口问题只是在少数发展中国家较为突出

D．人口增长应与社会、经济的发展相适应，与资源、环境相协调