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问题 单项选择题

X6132型万能铣床工作台快速移动可提高工作效率，调试时，必须保证当按下（）时，YC3动作的即时性和准确性。

A、SB2

B、SB3

C、SB4

D、SB5

答案

参考答案：D

选择题

Look! Some students _____ games under the big tree.     [ ]

A. play    

B. are play    

C. are playing  

D. played

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选择题

--- They are quiet, aren’t they? --- Yes. They are accustomed __________ at meals.

A．to talk

B．to not talk

C．to talking

D．to not talking
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