The children are jumping excitedly because they have _______ the design perfectly in groups．（ ）
A．completedB．controlledC．contactedD．caused
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B．
D．
_____ useful the information you've provided is!（ ）
A．What aB．WhatC．What anD．How
Father was so busy with his work that he had _____ time to read the newspaper．（ ）
A．someB．littleC．muchD．a bit of
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