单项选择题

______ I admit that the problems are difficult, I don't agree that they cannot be solved.

A. When
B. Where
C. While
D. Why
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Why do you want to change your job ______ you have got such a good one already
A. because
B. when
C. since
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This country is ______ for its many historic houses.
A. obvious
B. remarkable
C. abundant
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