问题描述：
--How do you like the songs sung by Liu Huan?
--They were wonderful ,( )I couldn't hear his words clearly sometimes.
A.because B.so C.but D.if
请说明原因.
--They were wonderful ,( )I couldn't hear his words clearly sometimes.
A.because B.so C.but D.if
请说明原因.
问题解答：
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