China moved to ______ its grain production when its grain output had kept declining for five consecutive years.

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问题 China moved to ______ its grain production when its grain output had kept declining for five consecutive years.

选项 A、turn up
B、take up
C、step up
D、make up

答案C

解析 turn up:出现,露面;take up:占用,着手于,开始做……,拿起;step up:增加;make up:编造,构成,弥补(for)
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