题目内容

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？

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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

My classmate went to the doctor's the day before yesterday. He had to wait for an hour before the doctor ____ see him.

A. can
B. could
C. may
D. might