At the meeting they discussed three different to the study of mathematics.
A. approaches
B. means
C. methods
D. ways
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(答案→)A. approaches
B. means
C. methods
D. ways
解析:考查名词:句意:开会的时候,他们讨论了三种不同的学习英语的方法。这几个词都有“方式,方法”的意思:但用法不尽相同:means/methods后面要接介词of, ways作为方式的意思的用法:ways+to do sth/of doing sth/that从句,而approach作名词“方式后面要接介词to即:approach to sth./doing sth,这句话to后面接的是名词,所以用approaches,选A。