问题
选择题
We live day by day, but in the great things, the time of days and weeks __________ so small that a day is unimportant.
A．is
B．are
C．has been
D．have been
答案
. 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。