单项选择题

Papers ______ in pencil don't count.

A．to write
B．writing
C．written
D．to have written
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单项选择题
What kind of a plane was it that crashed
A．A war plane.
B．A freight plane.
C．An ordinary plane.
D．A float plane.
单项选择题
According to the passage lunar researchers have focused mostly on ______.
A．the possibility of finding water on the Moon
B．the lunar regolith
C．cataloging various land formations
D．craters and their origins
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