Sometimes online distance learning can be a problem because __. A．learners can't afford it B．learners get too many hints C．it involves excessive writing D．it is not available at the weekend
A.learners B.learners C.it D.it
【参考答案】
C 从第二段可知，远程教育有很多优势，但也有劣势。劣势就是需要以写作来完成的东西太多。另外，此段还提到，远程教育......