[ Sentence Completion ]
The health study concludes that preventing disease is much —– expensive than treating it after it has developed.
A. less
B. least
C. lesser
D. lessen

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A. have
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A. Does/work
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A. must
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Choose the option that needs correction.
Lan cannot help you with homework now. She does the laundry at the moment.
A. cannot
B. help
C. does
D. at
