Question

4. Some students find certain grammar points and structures very difficult; , teachers need a reliable source of practice material to get these points across effectively.

   A. however   B. as a result

   C. even so   D. what's more

Answer 1

4. B

4. B解析：as a result意为“因此”。句 .意:有些学生觉得某些语法点和结构很难，因此，老师们需要一种可靠的练习材 料的来源来使得这些内容有效地被学生 们理解。