Nowadays，more Chinese provinces education reforms that will allow children of migrant workers to sit college entrance exams locally.
A. have announced
B. are announcing
C. announced
D. will announce
网友回答
(答案→)A. have announced
B. are announcing
C. announced
D. will announce
解析：A 考查时态。句意：如今，中国很多省市已经公布教育改革方案，允许外来务工人员子女在当地参加高考。由时间状语nowadays及句意可判断，此处用现在完成时表示对现在造成的影响。