Aware that mere would be trouble in the markets, she told him to______a planned software change to its systems.

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问题 Aware that mere would be trouble in the markets, she told him to______a planned software change to its systems.

选项 A、call to
B、call on
C、call off
D、call out

答案C

解析 动词短语辨析题。call off意为“取消”,根据语境,选项[C]正确。call to意为“向……喊;打电话给……”,call on意为“号召,呼吁;拜访”,call out意为“大声叫喊”,均与上下文意思不符,故排除。
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