单项选择题

Nobody noticed the thief slip into the house because the lights happened to ______.

A．be put up
B．give in
C．be turned on
D．go out
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单项选择题
______ I should fail again, I will not give up the experiment.
A．Even so
B．Although
C．Even if
D．Though
单项选择题
He didn't know German, ______ made it difficult for him to study at a university in Germany.
A．that
B．as
C．which
D．this
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