"the reason causing the problem is ..."应该是the reason for 还是 the reason 后面接ing

题目

"the reason causing the problem is ..."应该是the reason for 还是 the reason 后面接ing

答案

The reason causing the problem is that...
the reason 后面接ing 做后置定语 表示导致这一问题的原因
如果是the reason for 的话后面加名词,即为 the reason for the problem is that...