【題目】This kind of seafood is likely to go bad _____ it is treated immediately after it is caught from the sea.

A. as B. unless

C. since D. when

【答案】B

【解析】

考查連狀語從句。句意：這種海產(chǎn)品很容易變質(zhì)，除非一打撈上來就好好處理。分析句子可知，it is treated immediately作條件狀語從句修飾主句，其邏輯關(guān)系屬于if not，故選B。

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