问题
选择题
Despite their______ of interest，Fleming kept trying to develop the chemical ______ it would be safe and effective.
A．lacking；in order to
B．lack；so that
C．lack；so as to
D．lacking；so that
答案
答案：B
【点值】1
由第一个空格前的their可知，要填名词，所以用lack；第二个空要填连词，才能引导句子。故只有B项符合题意。