题目内容
A survey suggests that some people have difficulty ______ to write.
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It was in their company ______ we met and discussed the issue.
The decision about such a big railway project can not be made ______ each member of the board agrees.
There was no proof to show that this young man had committed thecrime,______ he was set free.
No sooner ______ than he was asked to start an another business trip.
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