Once you do it, you will feel that it es easy.
A. by and by
B. feet of clay
C. kill the fatted calf
D. garbage in, garbage out
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(答案→)A. by and by
B. feet of clay
C. kill the fatted calf
D. garbage in, garbage out
解析：考查谚语：A. by and by不久以后，不久，不一会儿很快，B. feet of clay 弱点， C. kill the fatted calf盛宴款待， D. garbage in, garbage out：“（计算机运算中）错进，错出，句意：--一旦你开始做了，很快你就会觉得这很容易。选A。