GMAT Sentence Correction (SC) | Re: It took me four times as long...

It took me four times as long to write the report collaboratively as it would have taken me to write it by myself.

A. as it would have taken me to write it by myself.
B. than it would have taken me to write it by myself
C. because it would have taken me to write it by myself
D. than writing it by myself would have done
E. as it took me to write it by myself