Professor Black and professor Smith will________in giving the class lectures.A、a

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问题 Professor Black and professor Smith will________in giving the class lectures.

选项 A、alter
B、change
C、alternate
D、differ

答案 C

解析句意：布莱克教授和史密斯教授将轮流讲课。alter意为“改变”；alternate意为“交替”，故选C。

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