you may -----find it hard to get along well with them

选择C possibly你可能会发现和他们不是很好相处。（告知者显然经验在先,有根据可言）主要关注may的存在。probably有道理可讲的不是凭空的有事实根据的“可能的”,而且常和will,would等一起出现,未发现和may一起出现使用。He'll probably find himself in pocket in a good year。年头好时,他会发现自己赚钱。A good weep would probably make you feel better。你痛痛快哭上阵也许就好受些了。而possibly包含太多主观色彩,根据较少,可以表达人的主观意愿和偏见和猜想和推测,可以和may一起使用。we may possibly run into them at the concert也许我们会在音乐会上遇见他们He is possibly the most selfish man in the town。他也许是镇上最自私的人。He has possibly gone to bed to have slept。他可能已经上床睡觉了。likely表达可能性较大的单词,事实根据充分有力,而且从不与may在一起出现,否则互相矛盾。They'll very likely come by car。他们很可能开车来。We anticipate that demand is likely to increase。我们预料需求可能增加。It is likely that they will kill the hostage。可能他们将杀掉人质。certainly无疑的确定的,和may在一起将会自相矛盾。I certainly did not like the place。我确实不喜欢那个地方。I will certainly see you into the train。我一定要送你上火车。