What a wonder! They've finished ________ 40% of the task within one week.
A. no more than B. no less than
C. not more than D. much less than
B no more than“仅仅;只是;还超过”; no less than“多达……;不少于……”; not more than“不超过;不比……多”; much less than“比……少很多”。根据What a wonder!可知B项正确。