题目内容

It is not always easy for the public to see _______ benefit a new invention can be of to human life.
A．whoseB．whatC．whichD．that
B
考查从句。因为benefit是一个名词，所以应该用what 说明。What benefit应该是放在be 和of之间。句意：对公众来说明白一项新发明对人类生活有什么好处是不容易的。
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