This approach, ______ more expensive than the basic one, provides us with considerably more usage flexibility.
A．a(chǎn)sB．sinceC．whileD．if
C

試題分析：考查連詞。A.as因?yàn)�，一邊．．．一邊，盡管（要用倒裝）B. since既然，自從．．．以來(lái)C.ｗhile當(dāng)．．．時(shí)候，盡管D.if如果。句意：這種方法，盡管比基本方法更昂貴，但我們提供了更多的使用靈活性。故選Ｃ
點(diǎn)評(píng)：不同的連詞要放在上下文中進(jìn)行考查，要注意一詞多義，如本題中as ，while均有“盡管”之意，但as要用倒裝，while不能用倒裝。
即學(xué)即練：We need some more facts and figures __________ we take the final decision.
A. since           B. before             C. after            D. until
選B
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