学校这一社会组织的细胞是()
A、学生
B、教师
C、班级
D、校长
参考答案:C
It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month.
A.worked
B.had worked
C.has worked
D.working
反垄断执法的特点是:();具有较强的政策性;享有较大的自由裁量权。