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【单选题】
If Pat bought a tennis shirt with matching shorts, what was the cost of the shirt ？（） (1)The total cost of the shirt and shorts was $20. (2)The ratio of the cost of the shirt to the cost of the shorts was 2:3.A.
条件(1)充分，但条件(2)不充分．
B.
条件(2)充分，但条件(1)不充分．
C.
条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D.
条件(1)充分，条件(2)也充分．
E.
条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
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