参考答案:
71. on → by
72. unaware → aware
73. as → than
74. it → which
75. at → in
76. hasn’t → hadn’t
77. American → Arab
78. as → like
79. falls → fell
80. of → /
n. 衣领,项圈,[机]轴环
vt. 抓住,为
参考答案:
71. on → by
72. unaware → aware
73. as → than
74. it → which
75. at → in
76. hasn’t → hadn’t
77. American → Arab
78. as → like
79. falls → fell
80. of → /