______ all of you are top students, only one will be chosen for the coming competition.
A．While B．SinceC．IfD．As
A

試題分析：句意：盡管你們都是很優(yōu)秀的學(xué)生，但是將只有一個(gè)學(xué)生將被選出來(lái)參加競(jìng)賽。While：盡管，當(dāng)...時(shí)候 Since：既然，因?yàn)?nbsp; 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(yǔ)從句。故選A。
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