Most lecturers find it expedient to use notes when addressing to graduate students.

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问题 Most lecturers find it expedient to use notes when addressing to graduate students.

选项 A、troublesome
B、expensive
C、useful
D、improper

答案C

解析 troublesome麻烦的：expensive昂贵的：useful有用的；improper不合适的。因为 expedient意为“有利的，权宜的”，故选C项。

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