Only by ______ your attention _____ what you are learning can you learn it well.
| A．focus; on | B．focusing; on |
| C．paying; on | D．pay; on |
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Only by ______ your attention _____ what you are learning can you learn it well.
| A．focus; on | B．focusing; on |
| C．paying; on | D．pay; on |
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