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2.

A) Many of them had lower stress.
B) Many of them had decreased efficiency.
C) Many students had worse grades if working less than 15 hours a week.
D) Many students had better grades if working less than 15 hours a week.

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3.

A) Working will make students graduate earlier.
B) Working will certainly cause a delay in students’ graduation.
C) Working doesn't necessarily affect students'graduation.
D) Working doesn't affect graduation even if students work full-time.

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4.

A) Don't have on-campus jobs.
B) Don't work more than 20 hours a week.
C) Don't take many courses each semester.
D) Don't consider working while in college.

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