______ we admit that there are some problems with the new system, we believe they can be solved.

A. Until B. While

C. As D. Unless

 

B

【解析】

試題分析：句意：雖然我們承認(rèn)新的系統(tǒng)存在著一些問(wèn)題，但是我們相信他們是可以解決的。A. Until直到……才；B. While 雖然；C. As隨著、因?yàn)椋籇. Unless除非。故選B。

考點(diǎn)：考查連詞。

 

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