自20世紀(jì)30年代以來,發(fā)明家們一直嘗試制造飛行汽車。(have been doing)
Inventorshave been trying tohave been trying to make flying cars since the 1930s.
【考點(diǎn)】固定搭配/句型.
【答案】have been trying to
【解答】
【點(diǎn)評】
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發(fā)布:2024/6/27 10:35:59組卷:0引用:1難度:0.9
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