89－08－06

6. The worldwide race to develop an affordable synthetic fuel has so far consumed billions of dollars and __________ few results.

(A) yielded

(B) yielding

(C) yield ha

(D) has a yield of

答案：A

答案倒是选出来了，就是不明白The worldwide race to develop 的用法，主语后面的不定式怎么解释

这里是不定式做定语,

被修饰词the worldwide race 和不定式部分to develop a synthetic fuel存在着逻辑上的施动关系.

发了两遍,呵呵

而且这个有并列呀。。。