there is____thing as a free lunchA no such B not such C no a D no such aB选项为什么不对求详解

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there is____thing as a free lunchA no such B not such C no a D no such aB选项为什么不对求详解
there is____thing as a free lunch
A no such B not such C no a D no such a
B选项为什么不对
求详解

there is____thing as a free lunchA no such B not such C no a D no such aB选项为什么不对求详解
There is no such thing可以看作固定用法,
as后面接的是there的实意,
例如:There is no such thing as a perfect human.
也就是说(a perfect human) is no such
不对吗?