After some time the second stage of the space shuttle, having used up its fuel,

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问题 After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.

选项 A、runs away
B、charges for
C、falls off
D、merges into

答案 C

解析

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Aftersometimethesecondstageofthespaceshuttle,havingusedupitsfuel,