______ luck would have it, we arrived in time to catch the 8:00 o’clock flight to Madrid.

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问题 ______ luck would have it, we arrived in time to catch the 8:00 o’clock flight to Madrid.

选项 A、Which
B、As
C、Before
D、Because

答案B

解析 本句为一个非限定性定语从句,从句引导词代替整个主句的内容,而C和D均与题意不符。非限定性定语从句中能用关系代词代替整个主句的只有which和as两个,其中,which通常只能居于主句之后,而as则既能放在主句之前,也能放在主句之后。而且,在一些习惯表达方式中,只能用as,如:as luck would have“;as is often the case;as is natural; as is usual with sb.等。本句中,该非限定性定语从句处于主句之前,同时又是as的习惯用法,故B为最佳答案
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