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