问题补充:
.A computer is so useful a machine we can use everywhere.
A. that
B. which
C. as
D. what
答案:
A. that
B. which
(答案→)C. as
D. what
解析: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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