The government has launched several campaigns to crack ______on pirating.

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问题 The government has launched several campaigns to crack ______on pirating.

选项 A、up
B、in
C、down
D、for

答案C

解析 本题考查介词辨析。分析句子可知,本题要求填入合适的介词与动词crack和介词on构成搭配。crack up意为“(精神)崩溃”。crack down on意为“打击,镇压,制裁”。根据空后的pirating(侵害版权者;盗版者)可知,答案应为[C]项。
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