题目内容

什么是接口？为什么外设需要通过接口连接系统？

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计算机对I/O端口编址时采用哪两种方法？在8086/8088CPU中一般采用哪种编址方式？

This office is very dirty and in a mess; it ____ cleaned.

A. can't have been
B. mustn't have been
C. wouldn't have been
D. shouldn't have been

Jeffery's score on the latest test is the highest in his class; he ____ have studied harder.

A. may
B. should
C. must
D. ought to

With piles of work on hand, she ____ to the cinema last night.

A. mustn't go
B. wouldn't go
C. oughtn't to go
D. shouldn't have gone