It is highly unlikely that she will arrive
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It is highly unlikely that she will arrive today.
A:very B:probably C:hardly D:possibly
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答案：A
highly和very都有“高度地、非常”之意，例如：I value the book highly．我对那本书评价很高。probably“大概、或许”; hardly“几乎不”，例如：I can hardly see the mark.我几乎看不见那个标记。possibly“可能地、也许”。