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t【答案与简析】1D。根据后面的buthewastoocareless，说明约翰的工作本来可以做得更好表示一种可能性，但是他太粗心了；如果用B约翰的工作肯定做得更好，但是他太粗心了。不合逻辑。2C。由NordoI可知，说话者对他为何迟到没有把握。指没有把握的推测一般用maymight＋have＋过去分词表示，而ca
＋have＋过去分词一般用于否定句或疑问句，故可排除A。
f3D。备选项B常用于否定句或疑问句，故可排除；备选项C通常有责备的语气，在此不合题意；备选项D表示一种有把握的推测，符合Theplaygrou
disallwet这一前提。4A。由前句的