They day _____I became a Young Pioneer was the happiest day in my life.
A that B where C when D which
人气：100 ℃ 时间：2020-06-26 15:54:22
解答
The day _____I became a Young Pioneer was the happiest day in my life.
C when
选择WHEN,我成为少先队员那天是我一生中最开心的一天.
那天是时间,所以用WHEN.
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