1 . The book was written in 1946, since ________ education system has witnessed great changes. (用适当的词填空)
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22-23高二上·上海·假期作业
2 . 他将把郊游推迟到5月1号,那时他将有空。
He will put off the picnic until May 1st,________ he will be free.
He will put off the picnic until May 1st,
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