Many years ago, the air was fresh and the water was clean here. We could bees and hear birds .

题型：单选题题类：常考题难易度：普通

仁爱科普版九年级上Unit 2 Saving the earth. Topic 1 Pollution has causestoo many problems.同步练习1

A、see; dance; sing B、see; dancing; singing C、saw; dance; sing D、saw; dancing; singing

举一反三

Everyone wants to live in a clean environment and {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.

The girl in that photo doesn't {#blank#}1{#/blank#} {#blank#}2{#/blank#} her at all.

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