My younger sister _the Youth League _2008.

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My younger sister ___the Youth League ___2008.
1 has joined~in 2 has ioined~since
3 joined~since 4 joined~in

4
整句意思是：我年幼的妹妹在2008年加入了共青团.
用过去时,用介词in,所以是4
有不懂得还可以问我

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