.A computer is so useful a machine we can use everywhere.A．thatB．whichC．asD．what 题目和参考答案——青夏教育精英家教网—

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.A computer is so useful a machine ________ we can use everywhere.

A．that

B．which

C．as

D．what

本题考查句子结构和关系代词的选用。首先表示认清句子结构，use后面应该接一个及物动词，先行词应该充当宾语，而前面出现so useful不能用that与which来修饰，可以排除。另外，what 不能引导定语从句。

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