55. assure sb. of sth. 向保证, 使确信.56. attach 缚, 系 ,结57. make an attempt at doing sth. 试图做58. attend to 注意,照顾;attend on 伺候,照料59. attitude to/ toward 对的态度.怎么看60. attributeto把归因于, 觉得是的结果 61. on the average 平均62. aware of 意识到,了解.63. at the back of 在后面64. in the back of 在后部; on the back of 在后部; be on one's back 卧病不起.65. at one's back 支持,维护; have sb. at one's back 有支持, 有作后台66. turn one's back on sb. 不理睬,背弃,抛弃67. behind one's back 背着某人68. be based on / upon 基于69. on the basis of 依据, 在基础上70. beatat 在运动项目上打赢71. begin with 以开始. to begin with 第一, 第一72. on behalf of 以名义73. believe in 相信,依靠,信仰.74. benefit 受益,得到好处.75. for the benefit of 为了的利益 76. for the better 好转77. get the better of 打败, 胜过.78. by birth 在出生上,论出身,按血统 at birth 在出生时; give birth to 出生79. blame sb. for sth. 因责备某人 . blame sth. on sb. 把推在某人身上80. in blossom开花 be in blossom开花 come into blossom开花81. on board 到船上, 在船上, 上火车或飞机82. boast of 吹嘘83. out of breath 喘不过气来84. in brief简言之85. in bulk 成批地,不散装的86. take the floor 起立发言 87. on business 出差办事.88. be busy with sth.于某事 。 be busy doing sth. 忙于做某事89. last but one 倒数2、90. but for 要不是. 表示假设91. buy sth. formoney 用多少钱买92. be capable of 可以, 有能力 be capable of being +过去分词:是可以被的93. in any case无论怎么样94. in case 万一;95. in case of 假如发生万一 in the case of 至于, 就而言96. in no case在任何状况下都不97. be cautious of 谨慎防范98. center one's attention on 把某人的注意力集中在上99. be certain of 有把握, 肯定.100. for certain of 一定地,有把握地
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