Hi,
My question is reference to Problem 10 of Chapter 6 (page 91) of the 2007 Edition Sentence Correction guide.
The incorrect sentence is: "The students did poorly on the test more because they hadn't studied than not understanding the material.
The answer states that the correct sentence should be: "The students did poorly on the test more because they hadn't studied than because they didn't understand the material."
Could somebody explain why that parallel sentence structure is correct? To me, it seems as though "hadn't studied" and "didn't understand" are not parallel. I thought "hadn't studied" and "hadn't understood" would be a better parallel verb structure. Or do I just need to brush up on my grammar skills a little bit more...?
--Michelle