摘要：13．解析:考查交际用语.Sure.go ahead表示同意帮忙.且问帮什么忙. 答案:D
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With his attention________on the shops along the roadside，he knocked an old man down while riding to school.
A concentrating B．concentrated C．to concentrate D．concentrates
答案 B
解析 考查词组，故选B项。
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— Nancy, what classes are you taking this term?
— _____ I want to take two English courses, or maybe Spanish. 【吉林省长春市2011届高三第二次模拟考试（东北三省四市联合调研）】【交际用语】
A. What’s up? B. It’s none of your business.
C. I’ve no idea. D. I’m not sure yet.
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