题目

题型：不详难度：来源：

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

B
【点值】1

解析

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。