Jenny worked hard___her lessons.A.in B.on C.at D.to 这题应该怎么选?

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Jenny worked hard___her lessons.A.in B.on C.at D.to 这题应该怎么选?
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Jenny worked hard___her lessons.A.in B.on C.at D.to 这题应该怎么选?
Jenny worked hard___her lessons.A.in B.on C.at D.to 这题应该怎么选?

Jenny worked hard___her lessons.A.in B.on C.at D.to 这题应该怎么选?
选B.