单项选择题
A professor， along with some students， （） now working in the new laboratory.
A.is
B.were
C.are
D.was
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Smithregretted（）tothemeetingyesterday.
A.not going
B.not having been going
C.not to go
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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
