The exercise that the researchers tried ontheir test subject

The exercise that the researchers tried ontheir test subjects wasA.walking brisk

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He is but a child.(  )

He is but a child.(  )A.probably B.not C.only D.hardly

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The fuel tanks had a capacity of 140 liters.(  )

The fuel tanks had a capacity of 140 liters.(  )A.function B.ability C.power D.v

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