特殊的无差异曲线有两种:完全互补的两种商品和完全替代的两种商品()
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He was the first person I’ve ever known to row across ___________ Atlantic.
A. a
B. the
C. /
Rose plays ___________ guitar in a band.
A. a
B. the
C. /
January is ___________ first month of the year.
A. a
B. the
C. /
The medicine is to be taken three times _________ day.
A. a
B. the
C. /