Bunuel wrote:
As a result of the continuing decline in the birth rate, less people will enter the labor force in the 1980’s than did in the 1960’s and 1970’s, a twenty year period during which people born after the war swelled the ranks of workers.
(A) less people will enter the labor force in the 1980’s than
(B) less people will be entering the labor force in the 1980’s as
(C) fewer people will enter the labor force in the 1980’s as
(D) fewer people will be entering the labor force in the 1980’s as
(E) fewer people will enter the labor force in the 1980’s than
we do not need to discuss about comparison to get OA for this problem. but, we can discuss comparison for other questions.
some special comparion sentence require zero subject in the second clause of comparison. look at choice e.
we can not add subjects for "than did...." . specifically, we can not add "number of persons," or, "persons" or "they", because all of these subjects will make wrong comparison. so this special pattern requires zero subject.
I give you another question from gmatprep.
According to a 1996 survey by the National Association of College and University Business Officers, more than three times as many independent institutions of higher education charge tuition and fees of under $8,000 a year than those that charge over $16,000.
(A) than those that charge
(B) than are charging
(C) than to charge
(D) as charge
(E) as those charging
this special pattern is the way for gmat to trick us. but no longer can it do so if we are informed