摘要：The scientists were waiting to see the problem . A.settle B.settled C.to settle D.settling
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The scientists were waiting to see the problem .
A. settle B. settled C. to settle D. settling
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The scientists were waiting to see the problem _______.
A. settle B. settled C. to settle D. settling
查看习题详情和答案>>The scientists were waiting to see the problem _______.
A. settle B. settled C. to settle D. settling
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