单项选择题

I'm sorry to have ______ you waiting for a long time.

A．kept
B．made
C．got
D．let
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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
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
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