souvik101990 wrote:
Verbal Question of The Day: Day 57: Sentence Correction
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Certain pesticides can become ineffective if used repeatedly in the same place；one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(A) Certain pesticides can become ineffective if used repeatedly
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