—When did your cousin begin to show his interest in medicine?—It was a Saturday
题型：不详难度：来源：
—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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答案
| C |
解析
| 本题修饰名词Saturday为定语从句，先行词Saturday为时间，关系词应该用when，故本题C。 |
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