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Nowadays, good babysitters are in great _____, so many companies have been set up to train good babysitters.

A. request
B. need
C. demand
D. requirement
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科目：高中英語 來源：同步題 題型：單選題

Nowadays, good babysitters are in great _____, so many companies have been set up to train good babysitters.

[     ]

A. request
B. need
C. demand
D. requirement

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