In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.
| A．making | B．made | C．to make | D．having made |
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In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.
| A．making | B．made | C．to make | D．having made |
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