多项选择题

目前在网络布线方面，主要有两种双绞线布线系统在应用，是哪两类？
A、四类布线系统
B、五类布线系统
C、超五类系统
D、六类系统

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单项选择题

There are three activities in the project. Activity A will take five weeks, activity B will take six weeks, activity C will take seven weeks. Activity A will take one week before activity B starts. Activity C will take one week after activity B starts. How long will the project take to complete?项目有三个活动,A活动要5周,B活动要6周,C活动要7周,A活动完成1周后B才能开始,C活动要在B开始后一周才能开始,项目一共要多久能完成? A.
12 weeks 12周 B.
13 weeks 13周 C.
14 weeks 14周 D.
17 weeks 17周

单项选择题

_______yesterday, you would have met Professor Jones. But now he has left for London.

A．Did you come
B．Had you come