单项选择题
Smith regretted （）to the meeting yesterday.
A.not going
B.not having been going
C.not to go
D.not to be going
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单项选择题
（）isasolutiontotheproblemofwatershortage，wehavetoputalloureffortstogether.
A.To work out
B.Working out
C.Work out
D.Being worked out
