Diabetes, a disease in which the body does not produce or properly use insulin, continues to frustrate researchers seeking the cause of the ailment.
A. continues to frustrate researchers seeking
B. continue to frustrate researchers who seek
C. has continued to frustrate researchers who are seeking
D. are continuing to be frustrating to researchers seeking
E. have continued to frustrate those researchers who seek
What is wrong with other Options?
OA A
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Diabetes, a disease in which the body
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