59. a. life b. cars c. warning d. problem
60. a. about b. to c. by d. on
61. a. use b. inform c. ask d. teach
62. a. let b. allow c. make d. give
63. a. have helped b. helped c. had helped d. was helped
64. a. speak b. have c. link d. put
65. a. lawyer b. doctor c. customer d. specialist
参考答案:51-65 addcc bbcac dbadc
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