_____all of the material,John passed the test easily.
_____all of the material,John passed the test easily. _____all of the material,John passed the test easily. A.Having studied B.If he had studied C.He studies D.To study
因为是因果关系,用状语从句也应该是原因状语从句, 即: As(Because) he had studied all of the material,John passed the test easily 这里是陈述过去发生的一个客观事实,没有条件意味 如果选B, 除非说: .If he 【had studied】 all of the material,John【 would have passed】 the test easily. 这是与过去事实相反的虚拟语气的动词形式