A. will be B. would be C. has been D. had been
解答：选（D）。本句考查是动词时态，主句动词用了一般过去时，而从句动作发生在主句动作之前，因此应该使用过去完成时。
9. The cost of traveling around the eight European countries can run as high ____ $2,000.
A. to B. as C. by D. for
解答：选（B） as + adj. / adv. + as…结构可用来表示原级比较。注意：第一个as（词性为副词）所修饰的adj. 还可以修饰名词；第二个as词性为连词，因此这一结构所连接的比较内容在形式和功能方面必须等同。
10. This book is designed for the learners ______ native languages are not English.
A. whose B. which C. who D. what
解答：选（A）题中所需的引导词应既能起到引导定语从句的作用，又可以修饰限定中心词native language。whose通常指人，也可以指动物或无生命的事物，关系代词who的所有格形式，又称关系限定词，在从句中做定语，符合题意。
11. The car _____by the side of the road and the driver tried to repair.
A. breaks down B. was breaking down C. has broken down D. broke down
解答：选（D）。句子两个名词由and连接，并且后者带由谓语，因此应为并列句。我们知道，由and引导的并列句前后的时态要保持一致，而and后的句子中的tried就给以提示，暗示前面的句子时态也应是过去时。
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