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

 A. that   B. which  C. as  D. what

選C。本題考查句子結(jié)構(gòu)和關(guān)系代詞的選用。首先表示認(rèn)清句子結(jié)構(gòu)，use后面應(yīng)該接一個及物動詞，先行詞應(yīng)該充當(dāng)賓語，而前面出現(xiàn)so useful不能用that與which來修飾，可以排除。另外，what 不能引導(dǎo)定語從句。

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