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题型：单选题题类：常考题难易度：普通

北师大版（一起点）小学英语三年级下册Unit 10同步练习（2）

—What are you doing?

— I'm ______things.

A、sell B、selling

举一反三

Listen! A rubbish truck is{#blank#}1{#/blank#}(clean) the street early in the morning.

Some people are their boats in the river.

They are {#blank#}1{#/blank#}(sing) in the tree.

There {#blank#}1{#/blank#} (be) many fish in the river. They {#blank#}2{#/blank#}(swim) happily now.

The boy is {#blank#}1{#/blank#} (talk) to his friend.

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