摘要： New medicines and instruments every day to extend life. A. develop B. are being developed C. are developing D. have developed [答案与解析]
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New medicines and instruments ______ every day to extend life.
A. develop B. are being developed
C. are developing D. have developed
查看习题详情和答案>>New medicines and instruments ______ every day to extend life.
A. develop B. are being developed
C. are developing D. have developed
查看习题详情和答案>>New medicines and instruments ______ every day to extend life.
A. develop B. are being developed
C. are developing D. have developed
查看习题详情和答案>>