单项选择题

A．who
B．what
C．where
D．whether
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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.
单项选择题
When did Sonja move to Chicago
A．Three days ago.
B．Three weeks ago.
C．Three months ago.
D．Three years ago.
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