I watch TV about half an hour 选for on at in 哪一个

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I watch TV about half an hour 选for on at in 哪一个

I watch TV about half an hour 选for on at in 哪一个
I watch TV about half an hour 选for on at in 哪一个

I watch TV about half an hour 选for on at in 哪一个
for

选 for

for 接一段时间

for 表示一段时间嘛 比如说我做什麽事情 持续了多久时间 就可以是 i was doing sth. for some time 记住这一个句型就好了 类似的都是for了