12.   we have enough evidence,we can't win the case.( 。
A.OnceB.As long asC.UnlessD.Since

分析 除非我們有足夠的證據(jù),否則我們贏不了這個案件.

解答 答案C.once一旦;as long as只要;unless除非;since因為.once引導時間狀語從句,since引導原因狀語從句,as long as引導條件狀語從句,但上下文語意不通順,故排除B.unless=if…not,引導條件狀語從句,根據(jù)句子所表達的含義,可知選C.

點評 本題考查從屬連詞的意義用法.在此句中從屬連詞引導條件狀語從句.

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