题型：单选题题类：真题难易度：普通

— Is Jack in the next room? — Well, it's hard to say. But I heard him ________ loudly when I passed by just now.

A、speak B、to speak C、spoken D、speaking

举一反三

Let's{#blank#}1{#/blank#} {#blank#}2{#/blank#}here

—I hope it won't happen again .

Everyone should {#blank#}1{#/blank#} environmental protection.

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