单项选择题

______ having an advanced degree in molecular biology, Ms. Dempsey has led several research projects in biotechnology.

A. Beneath
B. Beside
C. Besides
D. Between
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Goods that are returned ______ warranty should be accompanied by proof of purchase.
A. with
B. under
C. over
D. on
单项选择题
Health care workers should always explain the ______ effects of physical exercise to their patients.
A. benefiting
B. benefits
C. beneficiary
D. beneficial
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