He ______ his head, wondering how to solve the problem.

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问题 He ______ his head, wondering how to solve the problem.

选项 A、scrapped
B、screwed
C、scraped
D、scratched

答案D

解析用手“挠”头是scratch。scrap抛弃，废弃；screw用螺丝钉钉住；scrape刮，擦。句意：他挠了挠头，想知道么解决这个问题。

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