--- Do you really mean to prepare our lecture two months in advance?--- Sure. Anyway, ___________A.a good beginning is half done.B.a bird in the hand is worth two in the bush.C.a fall into a pit, a gain in your wit.D.the early bird catches the worm.
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D解析The early bird catches the worm. “早起的鸟有虫吃”；符合语境。A项意为“良好的开端是成功的一半。”；B项意为“二鸟在林，不如一鸟在手；多得不如现得”；C项意为“吃一堑，长一智”。