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引導(dǎo)讓步狀語從句，意為“盡管”，表示“盡管他們直到他的建議很有價(jià)值，但許多人都不理會(huì)”。

42.(2007重慶) 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：根據(jù)句意可知，留蠟燭在家里是為了以防停電。in case意為“以防萬一”。

43.(2007遼寧) 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引導(dǎo)讓步狀語從句，意為“雖然”，表示“雖然我們訂了座位，但是我們不得不等半個(gè)小時(shí)”。