A President entering the final two years of a second term is likely to be at a severe disadvantage and is often unable to carry out a legislative program.
19. A President entering the final two years of a second term is likely to be at a severe disadvantage and is often unable to carry out a legislative program. (A) likely to be at a severe disadvantage and is often unable to (B) likely severely disadvantaged and often unable to (C) liable to be severely disadvantaged and cannot often (D) liable that he or she is at a severe disadvantage and cannot often (E) at a severe disadvantage, often likely to be unable that he or she can
OG中的解釋跟dingxiang提的一樣: In C and D, cannot often carry out suggests that a President with limited time suffers only from an inability to achieve legislative goals frequently, not from a frequent inability to achieve them at all.