单项选择题


A．on which
B．by which
C．near which
D．in which
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单项选择题
A．aforeB．priorC．previousD．preceding
A．afore
B．prior
C．previous
D．preceding
单项选择题
The difference between the two versions of the timeline by NASA is
A．30 seconds.
B．5 minutes and 30 seconds.
C．7 minutes and 30 seconds.
D．3 minutes and 30 seconds.
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