41.(2007浙江) Many of them turned a deaf ear to his advice, __________ they knew it to be valuable.
A. as if B. now that C. even though D. so that

答案:C
解析:even though引导让步状语从句,意为“尽管”,表示“尽管他们直到他的建议很有价值,但许多人都不理会”。

42.(2007重庆) My parents live in a small village. They always keep candles in the house __________ there is a power cut.
A. if B. unless C. in case D. so that

答案:C
解析:根据句意可知,留蜡烛在家里是为了以防停电。in case意为“以防万一”。

43.(2007辽宁) We had to wait half an hour __________ we had already booked a table.
A. since B. although C. until D. before

答案:B
解析:although引导让步状语从句,意为“虽然”,表示“虽然我们订了座位,但是我们不得不等半个小时”。