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第1题

They had to examine the dead tiger before they had a _______ answer as to who killed it. A. positive B. senior C.
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第2题

________ you are free, why not go skating with us? A. Because B. Since C. As D. For
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第3题

That young man has made so much noise that he ___ not have been allowed attend the concert. A. could B. must C. wo
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第4题

String类中替换字符串的方法是（ ）。 A、substring B、replace C、indexOf D、split
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