The boy insisted _____ what the problem was, although the others gave up.
·to find out
·ofinding out
·ifinding out
·finding out
出自：西南石油大学土木工程施工与组织(专升本)
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The boy insisted _____ what the problem was, although the others gave up.
·to find out
·ofinding out
·ifinding out
·finding out
出自：西南石油大学土木工程施工与组织(专升本)