单项选择题

______ in thought, he almost ran into the tree in front of him,

A．Lost
B．To lose
C．Losing
D．Have lost
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单项选择题
______ England improve their game, they're going to lose the match.
A．Unless
B．If
C．As
D．As long as
单项选择题
The room ______ windows are painted blue is our classroom.
A．which
B．that
C．in which
D．whose
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