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【单选题】
My friend_______when I came in.

drank
drink
was drinking
【单选题】
8051单片机的并行I/O接口中,具有三态I/O能力的接口是。

P0
P1
P2
P3
【判断题】
在统一编址方式下,CPU访问I/O端口时必须使用专用的I/O指令

正确
错误
【单选题】
18.- Did you get a dictionary?- No, I _____, but there were not any _____.

tried; to be left
had tried to; leaving
tried to; left
had tried; have left
【单选题】
I listened to journalists [填空]were excited about the changes.

which
whom
whose
who
【单选题】
I asked the secretary if there were ______ tickets but she had only the expensive ______.

one, ones
any, one
some, ones
any, ones
【单选题】
In high school, I was very unpopular, and I did ( ) the discrimination from my classmates.

encountered
encounter
had encountered
will encounter
【单选题】
I haven’t finished my composition . I________ for two hours and a half.

have written it
have been writing it
wrote it
am writing it
【单选题】
I saw that she was in difficulty with all those parcels, so I offered my_____.

service
money
use
chance
【单选题】
I haven’t finished my composition. I ___ for two hours and a half.

?have written it
?have been writing it
?wrote it
am writing it