语法与词汇 Many technological innovations, such as the telephone, _____ theresult of sudden bursts of inspiration in fact were preceded by manyinconclusive efforts.

A、 whose appearance
B、 and appear to be
C、 are appearing
D、 that appear to be

【正确答案】 D

【答案解析】句意：很多科技创新，比如电话的发明，看起来好像是灵感突然爆发的结果，但实际上（在这些成就）之前，（人们）已经投入了很多无结果的努力。本题考查的是定语从句。定语从句是“the result of sudden bursts of inspiration”，它缺少主语和谓语动词，故答案为D项。