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【题目】The chemicals in cola will be bad for your teeth you clean them carefully.

A.unlessB.so thatC.whenD.although

【答案】A

【解析】

句意:除非你仔细清洁,否则可乐中的化学物质对你的牙齿不好。

考查状语从句。unless除非(引导条件状语从句);so that目的是,为的是(引导目的状语从句);when当……时候(引导时间状语从句);although尽管(引导让步状语从句)。根据句意可知,表示“除非你仔细清洁你的牙齿”,表示条件,用unless引导条件状语从句,故选A

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