—When did your cousin begin to show his interest in medicine?
—It was a Saturday __________ she noticed her uncle experimenting on a frog in his lab.
| A．that |
| B．what |
| C．when |
| D．which |
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—When did your cousin begin to show his interest in medicine?
—It was a Saturday __________ she noticed her uncle experimenting on a frog in his lab.
| A．that |
| B．what |
| C．when |
| D．which |
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