单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Less than two years.
B．More than a year.
C．Less than a year.
D．More than two years.

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填空题

progressive

填空题

In writing this passage, the author has first explained a general situation, and then presented his her own opinion with supportive examples.

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。