MOOCs ________ been proven to effectively teach the thousands of students who enroll in them and ________ provide revenues for universities.
A) have; do
B) have; do not
C) have not; do
D) have not; do not

Question

Quizplus · Accepted Answer

MOOCs have not been proven to effectively teach the thousands of students who enroll in them and do not provide significant revenues for universities.

MOOCs ________ Been Proven to Effectively Teach the Thousands of Students