Contests that promise cash prizes for winners are often used by employer to______ their workers.

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问题 Contests that promise cash prizes for winners are often used by employer to______ their workers.

选项 A、predict
B、transfer
C、discharge
D、motivate

答案D

解析 选项为各种动词,空格前直接就有"to",因此构成“to+空格”结构的"to不定式"。
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