第30期 短平快 点子+逻辑框架(3)

原因论述题 逻辑框架
One of the reasons I say that is because … [band 6+]
The primary reason is … [band 5.5+]
The root cause of this issue is …[band 6+]
Behind what we see, it is ... that is/has been playing a major role. [band 7+]

慎用due to/owing to
1.听起来有点正式，多写作、少口语
2.due to/owing to后面多接Problem，相对消极的原因