It is highly unlikely that she will arriv
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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就是very的意思，例如：I value the book highly．我对那本书评价很高。probably意思是“大概，或许”;hardly意思是“几乎不”，例如：I can hardly see the mark．我几乎看不见那个标记。possibly意思是“可能地，也许”。