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【单选题】
If the language defined by a grammar G is an infinite set, then the grammar must be ( ).
A.
Recursive
B.
Irrelevant
C.
Ambiguous
D.
Unambiguous
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参考答案：
举一反三
【单选题】If a grammar G is an unambiguous grammar, for any sentence, the sentence ().
A.
may have two different leftmost derivations
B.
may have two different rightmost derivations
C.
The leftmost derivation is different from the rightmost derivation
D.
There is only one derivation on the left and one on the right
相关题目：
【单选题】If a grammar G is an unambiguous grammar, for any sentence, the sentence ().
A.
may have two different leftmost derivations
B.
may have two different rightmost derivations
C.
The leftmost derivation is different from the rightmost derivation
D.
There is only one derivation on the left and one on the right
参考解析：
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