What kind of letter is it? It’s a letter of ______. [br] What was the first

游客2023-10-08 13

问题 What kind of letter is it?
It’s a letter of ______.
[br] What was the first problem he had?
The ______ didn’t work well.

选项

答案 tracking mechanism

解析根据文章中第三段第一话中的“For one thing, the tracking (跟踪) mechanism doesn’t work properly即可作答”。

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