单选题Which constructs a BufferedIputStream？（）A New BufferedInputStream（“in.txt”）；B New BufferedInputStream（new File（“in.txt”））；C New BufferedInputStream（Writer（“in.txt”））；D New BufferedInputStream（new Writer（“in.txt”））；E New BufferedInputStream（new InputStream（“in.txt”））；F New BufferedInputStream（new FileInputStream（“in.txt”））；
单选题
Which constructs a BufferedIputStream？（）
A
New BufferedInputStream（“in.txt”）；
B
New BufferedInputStream（new File（“in.txt”））；
C
New BufferedInputStream（Writer（“in.txt”））；
D
New BufferedInputStream（new Writer（“in.txt”））；
E
New BufferedInputStream（new InputStream（“in.txt”））；
F
New BufferedInputStream（new FileInputStream（“in.txt”））；
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