最关键是use XX to do才行；B选项as many as的不完整；以及C选项意思有点变化不要紧（Ron：都sensible即可）
https://www.manhattanprep.com/gmat/forums/organized-in-1966-by-the-fish-and-wildlife-service-t31104.html
also:
in general, OBJECTS OF PREPOSITIONS are very rarely the antecedents of pronouns. (i won't say never -- but rarely enough that, if you have to make a random guess, this is probably a pretty good standard by which to make such a guess.)
HOWEVER,
2) if you see an ambiguous pronoun that is NOT replaced by the correct noun in any of the other answer choices, then DON'T eliminate!
for an example, see problem 21 in the blue verbal supplement (in which the correct answer contains a technically ambiguous pronoun).
or see the problem in this thread!
1) if you see an AMBIGUOUS PRONOUN that is REPLACED BY THE CORRECT NOUN in OTHER ANSWER CHOICES, then ELIMINATE the ambiguous pronoun and keep the specific noun.
for an example, see problem 68 in the blue verbal supplement, in which "them" is split against "these companies".
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可以这样简单理解，only只强调紧接着的名词或动词，如only I，只有我吃蛋糕（强调人的特别性）： Only eat，我只是吃蛋糕，不对蛋糕做别的事（强调动作的特别性）； eat only cakes，吃的只有蛋糕这种东西，没有其它东西（强调食物的特别性）。