[单选题]The scientists have made an ________ study of the viruses that cause the disease.()BMl答案窝(daanwo.com)-大学生作业答案及考资分享平台
AexhaustedBMl答案窝(daanwo.com)-大学生作业答案及考资分享平台
BexhaustingBMl答案窝(daanwo.com)-大学生作业答案及考资分享平台
CexhaustiveBMl答案窝(daanwo.com)-大学生作业答案及考资分享平台
Dexhaustion