----You seem to have known Dr Smith for a long time.
---- That’s true. ______ he joined our club six years ago.
| A．Since | B．Until | C．When | D．Before |
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----You seem to have known Dr Smith for a long time.
---- That’s true. ______ he joined our club six years ago.
| A．Since | B．Until | C．When | D．Before |
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