They are doing ____useful work a.a b /说明原因，具体
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Theyaredoing____usefulworka.ab/说明原因，具体Theyaredoing____usefulworka.ab/说明原因，具体Theyaredoing____usefulwo
They are doing ____useful work a.a b /说明原因，具体
They are doing ____useful work a.a b /
说明原因，具体
They are doing ____useful work a.a b /说明原因，具体
b
正确答案是an ，选项里没有
useful元音开头，前面用an
What are they doing?
what are they doing?
what are they doing?急用!
还有一题:What.are.they.doing?They.are还有一题:What. are. they. doing?They. are the water
What are they doing怎么回答
They are doing some reading.改为一般现在时
What are they doing英语作文
They are doing some very important ( ) (work)
what are they doing怎么读
__________ __________ uesful work they are doing!
What are they doing?--They___(play soccer)
They are doing some English _(练习).
They are doing homework now.改为祈使句
He watches TV______________._________ are they doing?
what are they doing with it?
what are they doing for vacation中文
What are they busy 后用加doing吗?（Wat are they busy doing?)
They are doing----[they]homework 适当形式填空