单选题_____AsinceBuntilCthoughDbut
单选题
_____
A
since
B
until
C
though
D
but
参考解析
解析：
空格之前的“much cleaner（干净多了）”与其后的“new problem（新的问题）”之间是转折关系，在此选择表转折语气的“but”，故选D。
空格之前的“much cleaner（干净多了）”与其后的“new problem（新的问题）”之间是转折关系，在此选择表转折语气的“but”，故选D。
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