单项选择题
A.How long B.How length C.How many times D.How many shift
（）will reduce the visibility.A.dustB.sea waterC.land sa...
单项选择题（）will reduce the visibility.
A.dust B.sea water C.land sand D.wind
（）view of the fact，I wish to submit this report.A.InB.O...
单项选择题（）view of the fact，I wish to submit this report.
A.In B.On C.To D.For
（）using the derrick at once，the gooseneck is bent.A.Con...
单项选择题（）using the derrick at once，the gooseneck is bent.
A.Continue B.Start C.Commence D.Stop
