With his attention ( ) on the film,the boy didn't notice his father leaving quietly.A.concentrating B.concentrated C.to concentrate D.to be concentrated
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![With his attention ( ) on the film,the boy didn't notice his father leaving quietly.A.concentrating B.concentrated C.to concentrate D.to be concentrated](/uploads/image/z/13110932-20-2.jpg?t=With+his+attention+%28+%29+on+the+film%2Cthe+boy+didn%27t+notice+his+father+leaving+quietly.A.concentrating+B.concentrated+C.to+concentrate+D.to+be+concentrated)
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