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¡¡¡¡Àý: It is generally considered unwise to give a child ________ he or she wants.
¡¡¡¡A. however B. whatever C. whichever D. whenever
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¡¡¡¡21. Lessons can be learned to face the future, ________ history cannot be changed.
¡¡¡¡A. though B. as C. since D. unless