问题描述：
．The reporter said that the UFO ________east to west when be saw it.
The reporter said that the UFO ________east to west when be saw it.
A．was travelling B．travelled
C．had been traveling D．was to travel.
a or d
and why
a or c
The reporter said that the UFO ________east to west when be saw it.
A．was travelling B．travelled
C．had been traveling D．was to travel.
a or d
and why
a or c
问题解答：
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