41. It was _______ who helped Tom out when he was in trouble.

　　A. I B. me C. us D. ours

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　　43.—Will you go to the museum tomorrow?

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　　44. Mary used to stay up until far into the night, ______?

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　　45. It is very kind ______ you to supply us _______ so much information. Kaixin100内容管理系统

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　　48. I regretted _______ the days when I _______ hard at school.

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　　49. He’s sure you’ll pass the examination, _______?

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