题目列表(包括答案和解析)
The scientists were waiting to see the problem .
A. settle B. settled C. to settle D. settling
The scientists were waiting to see the problem _______.
A. settle B. settled C. to settle D. settling
The scientists were waiting to see the problem _______.
A. settle B. settled C. to settle D. settling
The scientists were waiting to see the problem ____ .
A. settle B. settled C. to settle D. settling
The scientists were waiting to see the problem ____ .
A. set B. settled C. to settle D. settling
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