Recent advances are described______the computer system for high production application.
A．how to improve
B．about improving
C．which improve
D．as improving

A.
A．how
B.about
C.which
D.as

【参考答案】

C
whichimprove…作advances的定语。此句译为：(文中)介绍了最近这方面的进展，这些进展改善了......

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