连接几个并列的成分
若是肯定句,用and
若是否定句,用or
其中这个否定句嘛,凡是有not、no的就是,而那些有never,nor等的都不算否定句
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cici1979923 发表于 2006-3-28 10:24 当然不对,这样not。。。but之后还是不对称呀应该是not caused by stress,alcohol, or rich foods, but cau ...
crazyep 发表于 2004-8-27 17:09 Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich f ...
gigiga0118 发表于 2005-8-24 23:03 B not caused by stress, alcohol, or rich foods, but are by 這個選項不可以解釋成 not caused by stress ...
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