单项选择题

The doctors tried their best to save the patient's life,（）failed.

A. or
B. so
C. but
D. because

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I enjoy the concert last night; they played（）beautiful music.

A. such
B. such a
C. so
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I feel （） unwise to give a child whatever he or she wants.

A. that
B. how
C. it
D. what
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