Professor Smith and Professor Michael______in giving us lectures.A、alteredB、alt

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问题 Professor Smith and Professor Michael______in giving us lectures.

选项 A、altered
B、alternated
C、changed
D、shifted

答案 B

解析动词形异义近辨析。alternate意为“轮流，交替”，如：alternate Mondays andSundays off交替安排星期一和星期日休息。

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[originaltext]M:Hello,canIhelpyou?W:Hello!IwaswonderingifProfessor