SAT语法题(11年sunday)IE题

Those who have
already attended a performance of the play have said that it is at once
exhausting because of its length and complexity but its clever plot is still
intriging.
(划线部分为but及以后)

不选:however it is intrguing in its clever plot
正确项: and intriguing because of its clever plot.

顺便求however的用法
还有这句中
at once放这是干什么用的

总觉得and intriguing 很奇怪,因为觉得应该是转折的语气

你好,首先at once 和and 是固定搭配,因此前面出现at once, 后面就应该是and来表示一致。
however 用作“然而”时是副词,不能连接两个句子,只有作为“不管怎样”才是连词,才能连接两个句子。
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第1个回答  2013-04-25
固定搭配at once ... and ...=both... and...
however一般考查副词的用法,表示”然而“,不能连接两个句子,所以你会遇到正确的是“...;however..."
这道题主要考查的是平行结构,exhausting 和intriguing都是形容词,而且because of 都平行,非常完美的平行:)
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