18．All the guests at the party were dancing and singing happily____suddenly the lights went down．（　　）
A．untilB．whileC．whenD．before

分析 所有聚會(huì)上的客人都在開(kāi)心地唱歌跳舞，這時(shí)燈突然熄滅了．

解答 答案是C．本題考查連詞的理解；并列連詞when表示"這時(shí)"，常常與過(guò)去進(jìn)行時(shí)連用，表示"正在…這時(shí)"，根據(jù)語(yǔ)境，客人們正玩得開(kāi)心"這時(shí)"等熄滅，故選C．

點(diǎn)評(píng) 首先要理解連詞的功能：并列連詞連接并列的詞、短語(yǔ)或句子；從屬連詞連接主從句；其次理解各連詞含義；最后結(jié)合語(yǔ)境做出判斷．

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