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题库 / Prep2007E2-SC-30
Most of the purported health benefits of tea comes from antioxidants--compounds also found in beta carotene, vitamin E, and vitamin C that inhibit the formation of plaque along the body's blood vessels.
comes from antioxidants--compounds also found in beta carotene, vitamin E, and vitamin C that
comes from antioxidants--compounds that are also found in beta carotene, vitamin E, and vitamin C, and they
come from antioxidants--compounds also found in beta carotene, vitamin E, and vitamin C, and
come from antioxidants--compounds that are also found in beta carotene, vitamin E, and vitamin C and that
come from antioxidants--compounds also found in beta carotene, vitamin E, and vitamin C, and they
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Choice e：
yes, something is indeed wrong.
at best, 'they' is an ambiguous pronoun that potentially refers either to 'antioxidants'/'compounds' or to 'health benefits'. at worst it refers to 'health benefits', the subject of the preceding sentence, by default. either way, you've got problems.
the other problem is that a single dash of the sort that sets off the descriptor in this problem is akin to a single comma: both set off an appositive phrase, which is NOT allowed to contain independent clauses (such as the one beginning with 'they' in choice e). choice d follows the rules here, as, after the dash, it contains only subordinate clauses.
if you use a single dash, then the stuff that is set off by the dash must actually continue all the way to the end of the sentence. if you are going to block off a modifier with dashes, then you must use two dashes to block off the modifier.
i.e., there is no such thing as a modifier that is blocked off by a dash on the left, but by a comma on the right. if you have a modifier that does not extend to the end of the sentence, then you must use either two dashes or two commas to set it off.
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