Gmat Sentence Correction 91, 92

91). Since 1981, when the farm depression began, the number of acres overseen by professional farm-management companies have grown from 48 million to nearly 59 million, an area that is about Colorado's size.

(A) have grown from 48 million to nearly 59 million, an area that is about Colorado's size

(B) have grown from 48 million to nearly 59 million, about the size of Colorado

(C) has grown from 48 million to nearly 59 million, an area about the size of Colorado

(D) has grown from 48 million up to nearly 59 million, an area about the size of Colorado's

(E) has grown from 48 million up to nearly 59 million, about Colorado's size

92). Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.

(A) acting as sentinels and to sound

(B) acting as sentinels and sounding

(C) to act as sentinels and sound

(D) to act as sentinels and to sound

(E) to act as a sentinel sounding


Answers --

91). C is the best choice.
A, B -- incorrect - subject verb agreement - plural verb "have" does not agree with singular subject "number".
D, E -- incorrect - unidiomatic - "up to" is wrong, correct idiom is "from x to y"

92). B is the best choice -- maintaining parallelism required among and within the three main verb phrases - defending, acting... sounding, and scouting
A, C, D, E -- incorrect - violating parallelism.