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)re
C．has beenD．have been
. A。
句子主語為the time，故用謂語要用單數(shù); 再根據(jù)句子前后的時態(tài)live和is，可知此處宜用一般現(xiàn)在時，不用現(xiàn)在完成時，故選A。
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