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But a week later , he thought _____ stamps was boring becaus

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But a week later , he thought _____ stamps was boring because it cost much time. A collecting
B collection C collecting D collected

Dogs show welcome by waving _____tails.
A they B their C them D theirs
A collect
1 A与C相同,答案就是collecting 动名词短语作主语
2 B
后接名词用形容词性物主代词
再问: A 是 collect , 我打错了。 抱歉
再答: 那第一道答案就是C
再问: And Lily helped him ———————— a kite. make makes made making 哪个诶。
再答: make 注;help sb do sth 固定用法‘ 帮助某人做某事’ 顺便提一下:前面的第二题不可能是用宾格,因为后面有‘tails 尾巴’ 是名词,修饰名词用形容词