单项选择 较易0.85 引用1 组卷360
The day _____ Nelson Mandela helped me was one of my happiest.
A.which | B.when | C.that | D.why |
18-19高一上·广东潮州·期末
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In my opinion, everyone has periods in their lives _______ everything seems very hard.
A.when | B.where | C.which | D.that |
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