相关考题
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单项选择题
（）time will the pilot be available?
A.What
B.When
C.A what
D.At when -
单项选择题
（）using the derrick at once, the gosseneck is bent.
A.Continue
B.Start
C.Commence
D.Stop -
单项选择题
（）will the discharging operations take?
A.How long
B.How length
C.How many times
D.How many shift
