单选题：The profit-sharing plan is designed to __________ the staff

题目内容：

The profit-sharing plan is designed to __________ the staff to work hard. A．calculate
B．demonstrate
C．speculate
D．motivate

参考答案：

答案解析：

__________ he has many friends, he is often feeling lonely.

__________ he has many friends, he is often feeling lonely.A．As B．When C．While D

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It can be inferred that the low birth rate may be partially attributed to ______

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