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单项选择题1.class TestSuper { 22.TestSuper（int i） { } 3. } 4.class TestSub extends TestSuper{ } 5.class TestAll { 6.public static void main （String [] args） { 7.new TestSub（）； 8.} 9.} Which is true？（）  

A、 Compilation fails.

B、 The code runs without exception.

C、 An exception is thrown at line 7.

D、 An exception is thrown at line 2.

  • A

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