He looked at the board, ( ) hard. A thought B thinking C thinks D to think

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He looked at the board, ( ) hard. A thought B thinking C thinks D to think

He looked at the board, ( ) hard. A thought B thinking C thinks D to think
He looked at the board, ( ) hard. A thought B thinking C thinks D to think

He looked at the board, ( ) hard. A thought B thinking C thinks D to think
B
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