Some little boys have difficulty ______their hearts into the lesson for a long time.

题型：单选题题类：模拟题难易度：普通

A、put B、to put C、putting D、to puting

举一反三

Great changes have{#blank#}1{#/blank#} {#blank#}2{#/blank#} in Zhejiang in recent years.

Children should {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} junk food,

She {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} at the party because she didn't know anyone.

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