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. havebeen
网友回答
(答案→)A. is
B. are
C. has been
D. havebeen
解析：决定下划线处谓语动词单、复数形式的主语应是the time，其后面定语“of days and weeks”包含的复数名词对谓语动词的形式不构成影响。