Gmat Sentence Correction 89, 90

89). John Smith provides information on the conditions that lead women to a gynecologist, and he notes that these conditions can, and sometimes are, used in the promotion of surgery which is not needed.

(A) and he notes that these conditions can, and sometimes are, used in the promotion of surgery which is not needed

(B) noting that these conditions can be, and sometimes are, used to promote needless surgery

(C) and notes that they could and sometimes are used unnecessarily in promoting surgery

(D) sometimes promoting needless surgery

(E) which they use sometimes to promote unnecessary surgery

90). Machines replacing human labor, there was wide anticipation that the workweek would continue to become shorter.

(A) Machines replacing human labor, there was wide anticipation that

(B) When machines replaced human labor, there was wide anticipation

(C) As machines replaced human labor, it was widely anticipated that

(D) Insofar as machines replaced human labor, it was widely anticipated

(E) Human labor being replaced by machines, there was wide anticipation that

Answers --

89). B is the best choice.
A - incorrect - wordy...Further "can be (used) and sometimes are used"..omits "be"
C, E - incorrect - ambiguous "they"
D - incorrect - who promotes needless surgery ?...not clear....Conditions or John Smith?

90). Best choice C - only choice to use past tense correctly throughout.
Why It is right in this choice, the link below explains ...

http://gmat-grammar.blogspot.com/2006/07/it-as-subject-of-sentence.html