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这道prep题挺有代表性的,所以贴上Ron的经典解释供大家参考:
heh. it looks like choice (a) is an "indian trap" seriously, not a joke. if there is a single biggest issue in the grammar of second-language english speakers who happen to hail from india or pakistan, that issue is the drastic overuse of the "are ...ing" construction. (native speakers of english will recognize "are producing" at once as awkward.)
another problem with part (a) is the modifier. although "providing... and milking..." is a grammatically acceptable modifier, it doesn't make any sense in context, since these are not two things that farmers do WHILE or AS A CONSEQUENCE OF keeping the cows cool. (if you're going to use comma + -ing, then one of these two should hold.) see #124 (og 12th edition) or #127 (og 11th edition), correct answer, for a sentence in which such a modifier actually does make sense.
the official answer, (e), is tricky indeed.
you have to parse it as follows: you KEEP THE COWS cool you KEEP THE COWS provided with... and you KEEP THE COWS milked regularly
ugly. very ugly. but (e) is the least ugly of the bunch, so it wins the proverbial pageant. i would much prefer "keep them cool, provide them with..., and milk them...", but that isn't there, of course. -- note that you also can't say "THE holstein cows", unless you're referencing a particular, specific, known group of holstein cows (something that you clearly aren't doing). since you're talking about holstein cows in general, you don't use the article "the". this is another thing well known, totally subconsciously, to native speakers of english; it's hard-won wisdom for non-native speakers.
还有prep笔记说ing修饰take care,大家此处也注意一下,Ron说是修饰keep them cool的,所以逗号+ing的伴随修饰应该是修饰最靠近的一个v的,不一定是主句了。
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