【单选题】【消耗次数：1】
下列哪一个行业最接近完全竞争行业。
①
飞机行业;
②
服装行业 ;
③
香烟行业;
④
玉米行业。
参考答案：
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If he_____the storekeepers scissors,he would have forgotten to buy a pair.
①
would not see
②
had not seen
③
having not seen
④
has not seen
【单选题】
It was not until she had finished all her work_____.
①
did she return
②
that she returned
③
when she returned
④
that did she return
【单选题】
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①
sensitive
②
senseless
③
insensitive
④
sensible