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31 省市学位英
北京学位英语试题精讲:非谓语动词1. It is not easy ____ the answer to the difficult math problem. A. to figure out B. figuring out C. figure out D. being figured out 【答案】A. 本题考查的是it 作形式主语真正的主语是to do这种句型很常见例如:Its di
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