Question

This approach, ______ more expensive than the basic one, provides us with considerably more usage flexibility.

A．as

B．since

C．while

D．if

Answer 1

C

試題分析：考查連詞。A.as因為，一邊．．．一邊，盡管（要用倒裝）B. since既然，自從．．．以來C.ｗhile當．．．時候，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
點評：不同的連詞要放在上下文中進行考查，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。
即學即練：We need some more facts and figures __________ we take the final decision.
A. since           B. before             C. after            D. until
選B