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．a(chǎn)reC．has beenD．have been
A
考查主謂一致。時(shí)間，金錢等做主語，謂語動(dòng)詞用單數(shù)，排除BD；本句沒有必要使用完成時(shí)。故答案為A。
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