摘要: With the help of high technology, more and more new substances in the past years. A. discovered B. have discovered C. had been discovered D. have been discovered
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With the help of high technology, more and more new substances____in the past years.
A. discovered B. have discovered C. had been discovered D. have been discovered
查看习题详情和答案>>With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
查看习题详情和答案>>With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
查看习题详情和答案>>