20. The agent was about to sign his name to the document    , to his surprise, a stranger broke in to prevent him.

A. while     B. when

C. as     D. until

20.   B考査狀語從句的連接詞。while雖然；when當(dāng)……時候， 這時；as正如；until直到。句意：代理人剛要在文件上簽字， 這時，讓他驚訝的是，一個陌生人闖進(jìn)來阻止了他。這里使用了固定結(jié)構(gòu)be about to do when ...意為"剛要做……這時……"，所以選B。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練2狀語從句

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