12.You can't get good grades _____ you study harder than before.( 。
A.ifB.unlessC.whenD.so

分析 除非你比以前更加努力學(xué)習(xí),否則你不會(huì)取得好成績(jī)的.

解答 答案:B.
本題考查的是從屬連詞的辨析.根據(jù)語(yǔ)境推測(cè)句意是"除非你比以前更加努力學(xué)習(xí),否則你不會(huì)取得好成績(jī)的."從句意來(lái)看,這里需要一個(gè)表假設(shè)的連詞,說(shuō)明后句是表假設(shè)的條件狀語(yǔ)從句,結(jié)合選項(xiàng),unless可以引導(dǎo)一個(gè)表假設(shè)的條件狀語(yǔ)從句,意為"除非",相當(dāng)于if not.故選B.

點(diǎn)評(píng) 本題主要考查連詞的用法,連詞在句子中主要起聯(lián)系上下文的作用,他們之間的區(qū)別就是表示邏輯關(guān)系的不同,所以在解題時(shí)先要理解上下文含義,然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞.連詞的用法都比較多,語(yǔ)義之間還有交叉,熟記其基本應(yīng)用規(guī)則,了解其區(qū)別,注意固定搭配對(duì)象,是做好此類題型的關(guān)鍵.

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