单项选择题

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A.Before 9 o’clock.
B.At 10 o’clock.
C.At about 9:15.
D.After 9:50.
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单项选择题
A.A space rocket can only be used once.B.The pilot can fly a space plane just like an ordinary plane.C.A space rocket travels much faster than a space plane.D.Both A and B.
A.A space rocket can only be used once.
B.The pilot can fly a space plane just like an ordinary plane.
C.A space rocket travels much faster than a space plane.
D.Both A and B.
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