注：17—20小题答案写在答题卡上
第二部分：知识运用（共两节， 45分）
第一节：单项填空 （共15小题，每小题1分，共15分）
从各题a、b、c、d四个选项中，选出可以填入空白处的最佳答案。
21. martin drove along for more than one hour _____he found a convenient parking place.
a. after b. once c .until d. since
22. this book teaches us how to analyze _______is causing the stress in our lift.
a. what b. when c. why d. how
23. _______you worked late yesterday, you need ’t have come this morning.
a. unless b. though c. once d. as
24. the man in front of me came to _____资源难易程度:★★★★★★★★★★★★★★★
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