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题库 / Prep2007E2-SC-63
Compared to those who do not, running three days a week saves an average of 14.1 percent on health-care costs each year in the United States.
Compared to those who do not, running three days a week saves
Compared with nonrunners, people who run three days a week save
Compared to not running, those running for three days a week save
When compared with those who do not, people running three days a week save
When compared to nonrunners, running three days a week saves
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(d) and (e) also misuse "when". you cannot use "when" unless you are literally talking about the timeframe in which an event takes place.
according to (d) and (e), these savings are only realized when someone is actually making the comparison. (i.e., only when someone else is looking at the statistics, comparing them, do these people actually save money!)
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