But a week later , he thought _____ stamps was boring because it cost much time. A collectingB collection C collecting D collected Dogs show welcome by waving _____tails. A they B their C them D theirsA collect

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But a week later , he thought _____ stamps was boring because it cost much time. A collectingB collection C collecting D collected Dogs show welcome by waving _____tails. A they B their C them D theirsA collect
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

But a week later , he thought _____ stamps was boring because it cost much time. A collectingB collection C collecting D collected Dogs show welcome by waving _____tails. A they B their C them D theirsA 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

A/C 一样
D
如上

1.collect
2.c