My younger sister ___the Youth League ___2008.1 has joined~in 2 has ioined~since3 joined~since 4 joined~in

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My younger sister ___the Youth League ___2008.1 has joined~in 2 has ioined~since3 joined~since 4 joined~in

My younger sister ___the Youth League ___2008.1 has joined~in 2 has ioined~since3 joined~since 4 joined~in
My younger sister ___the Youth League ___2008.
1 has joined~in 2 has ioined~since
3 joined~since 4 joined~in

My younger sister ___the Youth League ___2008.1 has joined~in 2 has ioined~since3 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

4

4.
join是个短暂动词,所以用过去时比用完成时更恰当。