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。

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