Bob promises to join in the football match ________ he has to help his parents on the farm.
A.ifB.a(chǎn)sC.unlessD.when
C

試題分析:if 如果,是否;as由于,作為;unless除非,如果不;when既然,當(dāng)……時。如果他在農(nóng)場上幫助他的父母,鮑勃許諾幫助參加這場足球比賽。故選C。
點(diǎn)評: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,注意固定搭配對象,是做好此類題型的關(guān)鍵。
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