.A computer is so useful a machine ________ we can use everywhere.
A．thatB．whichC．a(chǎn)sD．what
C
本題考查句子結(jié)構(gòu)和關(guān)系代詞的選用。首先表示認清句子結(jié)構(gòu)，use后面應該接一個及物動詞，先行詞應該充當賓語，而前面出現(xiàn)so useful不能用that與which來修飾，可以排除。另外，what 不能引導定語從句。
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