题目内容
正是由于缺乏帐篷一些人睡在露天。
It is ___________________________ tents that some people have to sleep______________..
for/through lack of ,in the open air

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题目内容
正是由于缺乏帐篷一些人睡在露天。
It is ___________________________ tents that some people have to sleep______________..
for/through lack of ,in the open air