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
考查從句。因為benefit是一個名詞，所以應該用what 說明。What benefit應該是放在be 和of之間。句意：對公眾來說明白一項新發(fā)明對人類生活有什么好處是不容易的。
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