问题
选择题
Professor Smith and Professor Brown will _____ in giving the class lectures.
A．exchange
B．alter
C．shift
D．alternate
答案
答案：D
考查动词词义辨析。alternate vt./vi. 轮流，交替发生或出现；shift般动，移动（vt.）；转移到，迁移（vi.）；改变；exchange交换；exchange... for ... 用.......换......；alter(部分)修改。
