题目内容

Listen to the ____ carefully to identify the tense you should use in your response

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Don't be afraid to correct your ____ when you are speaking, if you realise you have made any

Record yourself and ___ backwardsd

The IElTS speaking score is assigned at the __ of the test

为了起振容易，反馈型正弦波振荡器起振时的工作状态应设置为（）。

A. 丙类
B. 乙类
C. 甲类