In order to grow plants in a physically and chemically controlled environment, scientists at Iowa State University are using modular, economical, and toxic-chemical free Lego bricks, many believe they may solve several problems related to cultivation.
A) many believe they may
B)which are believed by many to
C)and that many believe
D)which, many believe, may
E)and which many believe will
OA: D
What's wrong with options B and C? Can any experts explain?
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In order to grow plants in a physically and chemically contr
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