10.     all of you are top students, only one will be chosen for the coming competition.

A. While    B. Since

C. If     D. As

10.   A考查狀語從句的連接詞。句意：盡管你們都是很優(yōu)秀的學生，但是只有一個學生將被選出來參加競賽。while"盡管"，作這一用法時，常用于句首；since既然，因為；if是否；as 由于，隨著。句意前后有轉(zhuǎn)折關(guān)系，所以用while引導(dǎo)讓步狀語從句。故選A。

題目來源：2015全品語法快練高中英語新課標 > 訓(xùn)練2狀語從句

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