【正确答案】
C
【答案解析】[听力原文]6-7
M: Hi, Alice. It's Jim speaking.
W: Hi, Jim. What's up?
M: I'm calling about the machines. Have you installed them?
W: Yes. We finished installing them last week.
M: When will you start testing tile machines?
W: Next Monday.
M: How long will it take?
W: About three weeks.
M: Good! Keep us informed.
W: We will. Bye!
6. When did they finish installing tile machines?
[试题类型] 细节题
[分析] 根据女士的回答"We finished installing them last week．”可知答案为C。