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
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C解析试题分析：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。考点：考查短语用法点评：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。