It is not always easy for the public to see _____ use a new invention can be of to human life.
A. whose
 B. what
 C. which
 D. that
B
考查連接詞，句意：對于公眾來說看到一項新發(fā)明對人類有什么用途并不總是很容易的。什么用途應表達為what use，what 作定語。所以選B。
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