单项选择题

So far there is no proof () spaceships from other planets do exist．

A．which
B．that
C．how
D．what

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单项选择题
On most of the nights. Jane () reading letters from her boyfriend.

A. stayed off
B. stayed on
C. stayed out
D. stayed up
单项选择题
It is difficult ()a world record and even more difficult to () it.

A. keeping, set
B. keep, set
C. set, keep
D. to set, keep
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