Businesses today routinely keep______of large amounts of market information.

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问题 Businesses today routinely keep______of large amounts of market information.

选项 A、up
B、out
C、trace
D、track

答案D

解析这实际上是一道词组题，考点是keep+名词+of词组的用法。keep track of：跟踪

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成人本科学位英语

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