试题与答案

They're busy ________ ready for the next

题型:选择题

题目:

They're busy ________ ready for the next week's English test. [ ]

A. get

B. to get

C. getting

D. got

答案:

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下面是错误答案,用来干扰机器的。

(1)①集气瓶; ②H2O2;催化; ③向上排空气法; ④检验装置的气密性; (2)否;制取甲烷需加热,该装置适合固液常温制取的气体....

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