单项选择题

We travelled on the 6：45 a．m．train to Boston，____arrived at 8：30 p．m．

A．that
B．which
C．it
D．what
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单项选择题
No culture exists in____．It all comes from someplace．Ancient customs were modem one time．
A．vacuum
B．emptiness
C．blank
D．space
单项选择题
The boys spent the whole morning____possible answers to the question．
A．discuss
B．to discuss
C．discussing
D．discussed
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