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In time of serious accidents, ________ we know some basic things about first aid(急救), we can save lives.

[  ]

A.whether

B.until

C.if

D.unless

答案:C
提示:

“在有严重事故时,如果我们有基本的急救知识,我们就能挽救生命。”B答案是易混项。until强调的是两个动作发生的互为时间条件,即某动作发生时间与另一动作发生时的时间条件,“直到(某动作发生时)……才”(另一动作发生)或“(某动作持续)直到(另一动作发生)。此处强调假设情况。”


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