Professor Black and professor Smith will________in giving the class lectures.

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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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