大学英语大学英语大学英语四级(CET4)大学英语四级模拟题09
题目内容

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

2024-07-09

A.Their office hours.

B.A twice-yearly regular visit service contract.

C.The installation and maintenance of a new system.

D.Cost of the engineers.

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