问题
选择题
Despite their______of interest, Fleming kept trying to develop chemical ______ it would be safe and effective.
A．lack, so as to
B．lacking, so as to
C．lack, so that
D．lacking, so that
答案
答案：C
题目分析：考查短语用法。Lacking要与介词in连用；名词lack与介词of连用，表示缺少…；so as to后面不能接句子，只能接短语；so that后面接句子。句意：尽管他们缺少兴趣，但是Fleming 还是不停地发展化学品，以至于那些化学品安全有效。故C正确。
点评：Lacking要与介词in连用；名词lack与介词of连用，表示缺少…；so as to后面不能接句子，只能接短语；so that后面接句子。