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【单选题】
When the White Hole Effect occurs, pilots shouldA.
transfer to the instrument flight immediately.
B.
base on visual flight rules and descend to look for a suitable ground reference
C.
base on visual flight rules and climb to expand the visual range
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举一反三
【简答题】文艺复兴式家具产生于（）
【单选题】We had only been driving for an hour when the car ______ petrol. [ ]
A.
was run out of
B.
was run out
C.
ran out of
D.
ran out
【单选题】We had been driving for hours ___________I realized that something was wrong with one of the tyres.
A.
as
B.
when
C.
while
D.
until
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