【单选题】Some linguists believe that the ______ age for children learning a foreign language is 5 to 8.
                    
A.optimistic
B.optional
C.optimal
D.oppressed
                
							【单选题】Some linguists believe that the ______ age for children learning a foreign language is 5 to 8.
                    
A.optimistic
B.optional
C.optimal
D.oppressed
                
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