that local witnesses are diffi_选项分析_考GMAT_GMAT学习频道

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Federal authorities involved in the investigation have found that local witnesses are difficult to locate, reticent, and suspicious of strangers.

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witnesses are difficult to locate, (are) reticent, and (are) suspicious of strangers

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平行的是 "are difficult to locate" "(are) reticent" "（are） suspicious of strangers" 是这三个adj.的平行，reticent不是跟locate平行的。 reticent"形容词：沉默的

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