作业帮the o____difficulty was that millions of other people had just the same idea.首字母填空，完形填空
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the o____difficulty was that millions of other people had just the same idea.首字母填空，完形填空
the o____difficulty was that millions of other people had just the same idea.
首字母填空，完形填空
the o____difficulty was that millions of other people had just the same idea.首字母填空，完形填空
obvious显而易见的