单项选择题

______ often I try, I cannot find the answer.

A．Although
B．Whatever
C．As
D．However
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单项选择题
Lover of towns ______ I am, I realize that I owe a debt to my early country life.
A．because
B．since
C．although
D．as
单项选择题
Such crimes may be so complex that months or years go by before anyone ______ them.
A．discovered
B．will discover
C．would have discovered
D．discovers
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