【題目】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:除非你仔細清潔,否則可樂中的化學(xué)物質(zhì)對你的牙齒不好。

考查狀語從句。unless除非(引導(dǎo)條件狀語從句);so that目的是,為的是(引導(dǎo)目的狀語從句);when當(dāng)……時候(引導(dǎo)時間狀語從句);although盡管(引導(dǎo)讓步狀語從句)。根據(jù)句意可知,表示“除非你仔細清潔你的牙齒”,表示條件,用unless引導(dǎo)條件狀語從句,故選A。

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