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We live day by day, but in the great things, the time of days and weeks __________ so small that a day is unimportant.
A.isB.are
C.has beenD.have been
. A。
句子主语为the time,故用谓语要用单数; 再根据句子前后的时态live和is,可知此处宜用一般现在时,不用现在完成时,故选A。
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