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句子写作：He is very busy preparing IELTS
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句子写作：He is very busy preparing IELTS. He has no time to play.
参考答案:
He is very busy preparing IELTS; therefore , He has no time to play.
句子写作：He is very busy preparing IELTS. He has no time to play.
参考答案:
He is very busy preparing IELTS; therefore , He has no time to play.