Our school-run factory _____ various kinds of chemical devices last year.
Our school-run factory _____ various kinds of chemical devices last year.
A、turned into
B、turned up
C、turned out
D、turned off
【正确答案】：C
【题目解析】：turn into 转变，变成； turn up 卷起，发现； turn off 关掉； turned out 生产，制造.
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